Report of the Committee on

Venting Systems for Cooking Appliances

Dennis N. Gage, Chairman ISO Commercial Risk Services, Inc., NJ

ThomasJ. Hard, Secretary TJ Hard Companies, OH

Phil Ackland, Commercial Vent Cleaning Co. Ltd, BC DonaldJ. Begley, Andersen Fire Apparatus Sales, Inc., NE

Rep. Nat'l Assn. of Fire Equipment Distributors Inc. Alfred Blair, Ventura Cnty Fire Dept, CA Laurence W. Caraway, Kitchen Klean Inc., NH

Rep. Int'l Kitchen Exhaust Cleaning Assoc. Robert B. Cummings, Gage-Babcock & Assoc., VA Paul W. Droll, ETL Testing Laboratories Inc., NY Charles H. Gibbons, Lampert, Lee & Assoc., WI Eliott B. Gordon, American Gas Assn. Laboratories, OH

Rep. American Gas Assoc. Donald L. Griffes, NEVTEC, VT Francis B. Hutto, Pabco Insulations, CO Joseph N. Knapp, McDonalds Corp., IL MichaelJ. Laderoute, ASCOA Fire Systems, OH

Rep. Fire Equipment Manufacturers' Assn. Inc. John P. Langmead, Gas Appliance Mfrs. Assn., VA R. T. Leicht, CIGNA Loss Control Services Inc., DE

Rep. American Insurance Services Group, Inc. James N. Macdonald, Travelers Insurance Co., CT Jeffrey C. Manley, Giles Enterprises Inc., AL Dan Miller, Little Ceasar Enterprises Inc., MI Philip O. Morton, Gaylord Industries Inc., OR

Rep. Nat'l Assoc. of Food Equipment Mfrs. Robert E. Niemeier, Southern Equipment Company, MO Jayendra S. Parikh, Underwriters Laboratories Inc., IL Harry Schildkraut, Cini-Little Int'l, Inc., IL

Rep. Foodservice Consultants Society Int'l Harold Schoendorf, Dade Cnty Building and Zoning Dept., FL

Rep. FL Assoc. of Plumbing, Gas and Mechanical Inspectors Inc. Joseph F. Schulz, Van-Packer Products Inc., NJ

Rep. American Society for Heating, Refrigeration and Air Cond Engrs Inc. Charles W. Shaw, S & S Fire Equipment, NY Lawrence E. Stahl, Stahl Enterprises Inc., NC

Rep. Nat'l Restaurant Assoc. Harry A. Thevenin, Firepro Inc., MA

ALTERNATES

Gary G. Hopson, The Travelers, MI (Air toJ. N. Macdonald)

Richard E. Hughey, ISO Commercial Risk Services, NJ (Air to D. N. Gage)

Harry P. Jones, Underwriters Laboratories Inc., IL (Alt toJ. Parikh)

Ralph Kerwin, Gage-Babcock & Assoc. Inc., CA (Alt to R. B. Cummings)

William Robert Klingeamaier, Ansul Fire Protection, WI (Air to M.J. Laderoute)

Richard Kukla, Robert Rippe & Assoc., MN (Alt to H. Schildkraut)

Roy Leonard, Scientific Fire Prevention Co., NY (Alt to L. Caraway)

Craig M. Morgan, Ventura Cnty Fire Dept., CA (Alt to A Blair)

Bruce A. Zimmerman, Avtec Industries Inc., IL (Alt to P. O. Morton)

Staff Liaison: Richard Ortisi-Best

This list represents the membership at the time the Committee was balloted on the text of this edition. Since that time, changes in the membership may have occurred.

Committee Scope. To develop standards for firesafety in the design, installation and use of exhaust systems (including hoods, grease removal devices, exhaust ducts, dampers, air moving devices and auxiliary equipment) for the removal of products of combus- tion, beat, grease and vapors from cooking equipment including the application of associated fire extinguishing systems.

The Report of the Committee on Venting Systems for Cooking Appliances is presented for adoption.

This Report was prepared by the Technical Committee on Venting Systems for Cooking Appliances and proposes for adoption amendments to NFPA 96-1991, Standard for the Installation of Equipment for the Removal of Smoke and Grease-Laden Vapors from Commercial Cooking Equipment, published in Volume 4 of the 1992 National Fire Codes and in separate pamphlet form.

The Committee is proposing to rename the document "Ventilation Control and Fire Protection of Commercial Cooking Operations."

This Report has been submitted to letter ballot of the Technical Committee on Venting Systems for Cooking Appliances whicb consists of 28 voting members, in 4 segments.

Segment No. 1 consists of all Cbapter 8 proposals (Log #27-100).

Segment No. 2 consists of a new Solid Fuel Cooking Equipment Chapter 11, (Log #113).

Segment No. 3 consists of all proposals on Recirculating Systems, Chapter 11 (old), Chapter 10 (New) (Log #12-46).

Segment No. 4 consists of the balance of proposals.

On Segment No. 1, 26 voted affirmatively, 1 negatively (Mr. Miller), and 1 abstained. Mr. Miller stated:

"l do not agree with protection type code writing to advance the cleaning industry or supplier based business. The code should be written to give the authorities having jurisdiction responsibility for individual cleaning standards."

On Segment No. 2, 26 voted affirmatively, 1 negatively (Mr. Droll), and 1 abstained. Mr. Droll stated:

"There are many technical issues contained in the Solid Fuel Cooking Equipment, Chapter 11 that need to be explored in more detail."

On Segment No. 3, 25 voted affirmatively, 2 negatively (Messrs. Manley and Parikh), and 1 abstained. Mr. Manley stated:

"The committee's action to eliminate exceptions, increase restrictions and continue to uphold a double standard for recirculat- ing systems has forced me to vote negatively."

Mr. Parikh stated:

"UL is submitting a negative ballot on the subject proposal for the reasons given below, which are technical in nature. UL's position and comments on this issue were included in its April 10, 1991 letter to your Mr. Arthur E. Cote, and still remain unchanged today due to the following reasons.

Proposal Lacks Technical Justification: Variation requirements in the proposal have been established

without providing technical justification. Although many of the requirements in NFPA 96 do apply to products of this type, performance-oriented requirements need to be developed for these devices to address the different concept used in their design and construction. Fire and other tests developed by UL for these devices offer such requirements.

The Reauirements Belong In A Product Standard

UL believes that requirements pertaining to inherent construction andperformance of recirculating systems are best addressed in a product Standard, and that the installation and use standard, NFPA 96, include only requirements pertaining to installation and use.

UL Action To Adoot New and Revised Requirements

In November 1990, UL developed an outline of investigation which served to publish current requirements for these devices. On August 31, 1992, UL issued a proposal for new and revised requirements covering recirculating systems for review by industry and others interested including the NFPA 96 Committee members. UL plans to adopt and publish these new and revised requirements next year as a revision to our Standard for Commercial Electric Cooking Appli- ances, UL 197.

238

Q.omments On Specific Technical Isso¢8

C o m m e n t s which addr,~ss specific issues in the proposed require- men t s for these devices toUows:

Specific C o m m e n t s on the Proposal to NFPA 96 Covering Recirculating Systems

The following i tems art: n u m b e r e d the same as in the proposal.

10-1. e - These requ i rements refer to compliance with Chapter 6. Paragraph 6-2.1 prohibits the field installation of any wiring in a duct. Since recirculating systems are des igned and manufac- tured as one complete product ,and since various Recognized condui t systems are available to isolate the wire leads f rom the exhaus t products, an exception shou ld be made to allow for such designs. Paragraph 10-2.6 does no t seem to prohibi t these designs. To address and clarify this, we suggest following be added at the end of this item: "(see except ion in Paragraph 10-2.6)."

- We suggest tha t this s t a t ement be supp lemen ted to include "(specifically with regard to Items a, b and f). ' This will serve to clarify the requirement .

10-2.3 - The cooking surface area limitation for the cooking equ ipmen t is an effort to reduce the increased risk of fire by limiting their sizes. However, once the cooking surface fire has been ext inguished by the ext inguishing system provided with the device, its size shou ld not mat ter and therefore should not be limited. Also, there is no basis for l imiting the electrical or gas energy rating for the specified cooking e q u i p m e n t since the cooking oil or grease does no t become a fire hazard until it reaches its ignition tempera- ture. This would not h a p p e n without failure of at least two tempera ture controls. A h igher electrical or I~as energy rating would jus t m e a n a h igher hea t inpu t rate, mean i ng that if the oil or grease fire were to occur due to the device's electrical malfunct ion, it would occur earlier t han later.

10-2.4 - The re is no basis to prohibi t the use o f a recirculating system with an open broiler or an open conveyor-type oven and broiler since their pe r fo rmance would be evaluated by the testing laboratory in a m a n n e r equivalent to that used for the device with a deep fat fryer. Some authori t ies having jurisdict ion have even de te rmined that an open conveyor-type oven, cooking certain types of foods, would no t p roduce grease-laden vapors and, therefore, does no t require even a conventional hood and duc t system covered by NFPA 96.

10-2.5 - An exhaus t outlet dampe r is requi red to reduce the risk of fire spread if a fire should be present in the hood area. Also, Paragraph 10-5.1 requires an ext inguishing nozzle to be installed downst ream of the last lilter and within the hood. Either require- ment , which is specification-oriented, seems to be unjustified. To require both construct ion features suggests unusua l extra protect ion that is also not justified.

102.7 - This r equ i r emen t has been established to reduce the risk of ignition if the power supply has e n o u g h energy to mainta in a spark sufficient to raise the tempera ture o f grease-laden vapors to its ignit ion point, a l though the use of a "non-cold spark" power supply is no t likely since this feature is utilized in reducing the risk of electrical shock, this restriction is unjustified. No technical data is available suggest ing that ignition migh t occur when a "non-cold spark" power supply is used and there have been no repor ted fire incidents involving this type of power supply.

- EPA Test m e t h o d No. 202 does not apply to this kind of product testing since it was developed to measure particulate emissions in industrial flue gas stacks.

- This r equ i r emen t does no t include the option when appropriate to restrict installation in non-combust ib le sur roundings only. We suggest the following be added: "or labeling to indicate use in non-combust ib le su r round ings only."

- There is no reason to restrict the application of recirculating systems to situations where the electrical connect ion is made by p e r m a n e n t wiring. The use of a suitable flexible cord and plug a r r angemen t is satisfactory.

10-3.2- This appears to be too restrictive. These products typically use an assor tment of various filters. We suggest that it be restated to indicate that proving interlocks are only required for those filter componen t s that were in place dur ing the emission test. If the manufac tu re r chooses to include supplementa l filter componen t s that upon removal will no t effect filter efficiency and when in place will no t effect grease-laden vapor capture by the hood, interlocks for such supplementa l filters should no t be necessary.

10-3.3- It is unnecessary to require shutdown of an appliance when per formance of the electrostatic precipitator drops below some value (that has no t been defined0. This may encourage defeat ing the manua l reset device or circuit indefinitely in order to cont inue to use the product . It is more appropriate to specify the level at which the sensor is to recognize insufficient per formance and to actuate an integral light a n d / o r buzzer to call a t tent ion to dais problem.

10-4 - This very general r equ i r emen t will no t ensure consistent review by the authorit ies having jurisdict ion t h r o u g h o u t the country. The criteria has not been specified to indicate what is suitable and what is not suitable. This is an example of a r equ i r emen t being applied to recirculating systems that is no t applied to conventional hood and duct systems, and for which no technical justif ication has been provided.

- See c o m m e n t to Paragraph 10-2.5.

~ - a f i re ext inguishing system actuat ion device downst ream of an electrostatic precipitator (ESP) should no t be necessary whenever an ESP is used. It may be required if the ESP uses a "non-cold spark" power supply. However, no technical justification for the same is available as men t i oned in I tem 10-2.7. In addition, if the ESP uses a "cold spark" power supply, the risk of ignit ion has already been reduced due to the reduced electrical energy.

10-6.5 - Since these devices mus t be listed with a testing lab per Paragraph 10-2.2, they will need to know whether the inspect ion and testing of all safety interlocks required can be pe r fo rmed by anyone, or if it is to be conducted by factory-trained service personnel , or if ei ther a r r angemen t is satisfactory. This is necessary in order to reduce the risk of electric shock for the person per forming this operation. Hence, this r equ i r emen t should be revised accordingly.

O n Segmen t No. 4, 27 voted affirmatively, 1 abstained.

239

NFPA 96- - F93 TCR

(Log # 3) 96 - 1 - (Entire Document ) : Reject SUBMIq~FER: Michael N Bryant, Clearwater, FL RECOMMENDATION: Remove the te rm "Grease-laden air" f rom text of NFPA 96. SUBSTANTIATION: Due to the fact no definition exists in 1-2 Definitions of NFPA 96, it cannot be de t e rmined which appliance or cooking condi t ion generates grease-laden air. This results in bui lding officials, without a basic under s t and ing of physics, applying the te rm grease-laden air to any appliance processing products with minute a m o u n t s of fat hea ted well below the vaporization tempera- ture of fats/greases. COMMITTEE ACTION: Reject. COMMITrEE STATEMENT: Sufficient technical data was no t submit ted to suppor t the r ecommenda t ion . Commit tee Action follows the rationale for 96-8 (Log #4).

(Log # 79) 96- 2 - (Title): Accept in Principle SUBMITTER:John K. Bouchard, SedgwickJames of N.E. RECOMMENDATION: Revise the title of the s tandard to read:

"Fire Protection of Commercia l Cooking Operations." SUBSTANTIATION: With the advent of recirculating systems, the tide of NFPA 96 is no longer appropriate. COMMITTEE ACTION: Accept in Principle. Revise the title of NFPA 96 to read:

Ventilation Control and Fire Protection of Commercia l Cooking Operations. COMMITTEE STATEMENT: Commit tee agreed with the in tent of the submitter, but chose to retain a reference to the ventilation capture, conta inment , and control funct ions of the standard.

(Log # 47) 96 - 3 - (1-1): Accept in Principle SUBMITTEI~ Joseph N. Knapp, McDonald ' s Corp. RECOMMENDATION: Revise text as follows:

Scope. This edit ion of NFPA 96 covers actual and potential fire safety concerns (preventative and operative), related to the design, installation, operation, inspection, and ma in t enance of all public and private cooking operat ions except normal residential cooking operations. This includes, bu t is no t l imited to all m a n n e r of cooking equipment , exhaust hoods, grease removal devices, exhaus t ductwork, exhaust fans, dampers , fire ext inguishing equipment , and all o ther auxiliary or ancillary componen t s or systems tha t are involved in the capture, conta inment , and control of grease laden cooking effluent. SUBSTANTIATION: This is to more accurately cover the scope of cur ren t cooking technology that is now seen on the market , and to provide for o ther address ing fur ther cooking technology. COMMITrEE ACTION: Accept in Principle.

Revise first part of first sentence to "This edit ion of NFPA 96 provides the m i n i m u m fire safety requ i rements ...", and revise last part of that sentence to ... except single family residential usage." Revised 1-1 will read as follows:

1-1" Scope. This edit ion of NFPA 96 provides the m i n i m u m fire safety requi rements (preventative and operative), related to the design, installation, operation, inspection, and ma in tenance of all public and private cooking operat ions except single family residen- tial usage. This includes, bu t is no t l imited to all m a n n e r of cooking equipment , exhaust hoods, grease removal devices, exhaus t ductwork, exhaust fans, dampers , fire ext inguishing equipment , and all other auxiliary or ancillary componen t s or systems that are involved in the capture, conta inment , and control of grease laden cooking effluent. COMMITTEE STATEMENT: The commit tee agreed with submit ter and made editorial changes to refine the application to single family residential cooking.

96 - 4 - (1-2): Reject (Log # 32) SUBMITTEPe James T. Otenbaker , Nat'l Assoc. of Ventilator Mfrs. RECOMMENDATION: Delete the definit ion of "Grease Extrac- tors" and revise the definit ion of "Grease Removal Devices" to delete reference to "grease extractors."

Definition of "Grease Removal Devices" would read: "Other c o m p o n e n ~ o f . . . definit ion of "~i . . . . . h~t~ , , , " 6,

"grease filters" ye t . . , such vapors or particles."

SUBSTANTIATION: "Grease Extractors" m e n t i o n e d in NFPA 96 as a listed device which was a UL produc t category is no longer available. In a recent change, based on the industry 's and others ' input, UL inc luded these products with other exhaust h o o d categories. The "Grease Removal Devices," as def ined (with the chan~e suggested above), cover the "Grease Extractors." Also, the def imtion of "Grease Extractors" states: " . . . leaving the existing air with a lower a m o u n t of combustible matter," which seems to indicate efficiency of the grease extractor and since its efficiency is no t measured, these terms are misleading. COMMITrEE ACTION: Reject. COMMITrEE STATEMENT: Existing definit ion is clear and necessary.

(Log # 48) 9 6 - 5 - (1-2): Reject SUBMITTER:Joseph N. Knapp, McDonald ' s Corp. RECOMMENDATION: Change the last port ion of "Labeled" to read:

"and whose labeling claims equivalency with this standard, or per formance in a specified manner . " SUBSTANTIATION: To clarify the misconcept ion that all "labeled" equ ipmen t is viewed as equivalent to dais s tandard by the committee. COMMITTEE ACTION: Reject. COMMITI'EE STATEMENT: The definition of "labeled" is one of the s tandard NFPA definit ions used in o ther NFPA codes and s tandards and the commit tee did no t feel the r e c o m m e n d e d change warrented peti t ioning the Standards Council to change the definit ion t h roughou t the system.

(Log # 49) 96 - 6 - (1-2): Reject SUBMITTER:Joseph N. Knapp, McDonald ' s Corp. RECOMMENDATION: Change the last part of "Listed" to read:

"and. whose.listing, clmrns ei ther that the equ ipmen t or material _is eqmvalent with this standard, or has been tested and f o u n d suitable for use in a specified manner . " SUBSTANTIATION: To clarify the misimpression that all "listed" equ ipmen t is d e e m e d equivalent with this s tandard in the under- s tanding of the commit tee . COMMITrEE ACTION: Reject. COMMITrEE STATEMENT: Same as the Commit tee Sta tement for 96-5 (Log #48).

( L o g # 110) 96 - 7 - (1-2): Accept SUBMITTERz Technical Commit tee on Vent ing Systems for Cooking Appliances RECOMMENDATION: Revise definit ion of "Hood" by delet ing last two sentences. Revised definit ion of hood will read as follows:

Hood. A device provided for a cooking appliance(s) to direct and aden vapors and exhaust g es

IATION: Removes requ i rements f rom a definition. COMMITI'EE ACTION: Accept.

(Log # 4) 96 - 8 - (1-2 (New)): Reject SUBMITTER: Michael N Bryant, Clearwater, FL RECOMMENDATION: Add the following new definition:

C,~rease-laden vapors. Grease vapor concentrat ions above 5.0 rag/ m due to greasy products being hea ted to their respective vaporization tempera ture or en t ra ined in air by being carried with the steam from the hea ted product . SUBSTANTIATION: Definition of term grease-laden v ~ o r s does not exist in NFPA 96. The concentra t ion of 5.0 m g / m ~ is the threshold for m e a s u r e m e n t by colormetric type air sample test. The colormetric test is a oil and mist test of air per EPA m e t h o d #418 and approved by EPA, OSHA, ACGIH and ABIH to insure air s tandards with respect to a i rborne oil and grease. COMMITTEE ACTION: Reject. COMMITI'EE STATEMENT: Sufficient technical data was no t submit ted to suppor t the proposed definition.

240

N F P A 96 ~ F 9 3 T C R

(Log # 80) 9 6 - 9 - (1-2 (New)): Reject SUBMITTER:John K. Bouchard, SedgwickJames of N.E. RECOMMENDATION: Add a retroactivity s ta tement as follows:

1-2 Retroactivity. The ,provisions of this d o c u m e n t are considered necessary to provide a reasonable level of protection from loss of life and property f rom fire and explosion• They reflect situations and the state-of-the-art prevalent at the t ime the s tandard was issued.

The s tandard applies to both new construct ion and existing buildings. The authori ty having jurisdict ion shall de te rmine the adequacy of protection of commercial cooking operations f rom fire in accordance with this standard. The requi rements may be modif ied for existing buildings if their application clearly would be impractical in the judgrr lent of the authori ty having jurisdiction, but only where it is de te rmined by the authori ty that the existing situation does no t invoNe a distinct hazard to life or adjacent property.

R e n u m b e r existing I-2 and subsequent sections. SUBSTANTIATION: The s t a n d a r d d o e s not now state if require- ments to protect commercial cooking operat ions are for new construct ion only, or if the requi rements also apply to existing operations. A retroactivity s ta tement will express the Commit tee ' s i n t en t COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The r ecommenda t ion of enforce- men t members of the commit tee and enforcers a t tending the meet ing was to remain silent on the issue of retroactivity, and the Commit tee agreed•

(Log # 71 ) 96- 12- (1-3.2): Reject SUBMITTER: F. B. Hutto, Jr., Pabco R&D RECOMMENDATION: Revise text to read as follows:

"Hoods, grease extractors and ducts shall have a clearance of at least I0 ;,~. ' . . . . . . . . . . . . . . 3 in. (76.2 ram) to l imited-combustible and, 0 in. to noncombust ib le material. All ducts shall be enclosed between the hood and the building exit. SUBSTANTIATION: Eighteen inch clearance to combustibles is unsafe as demons t ra ted by video at the March 31, 1992 NFPA 96 meet ing in Quincy. COMMITTEE ACTION: Reject COMMITTEE STATEMENT: Commit tee felt that insufficient technical data was submitted, that there is a need for an industry concensus, and also that "All ducts" in the last sen tence is in conflict with other parts of the standard.

(Log # 73) 96 - 13- (1-3.2 Note): Accept SUBMITTER:Joseph N. Knapp, McDonald 's Corp. RECOMMENDATION: Add to the end of the NOTE tile following:

"Where such direct contact is made the duct shall be protected from corrosion due to this contacL" SUBSTANTIATION: To provide for protection of ductwork lhat may come into minimal contact with the building surfaces. See last sentence of 3-6.2. COMMITTEE ACTION: Accept•

(Log # 106) 96- 10- (1-2, 3-5.2.1): Accept SUBMITTER: TechnicM Commit tee on Vent ing Systems for Cooking Appliances RECOMMENDATION: Revise the definit ion for "Cont inuous External Weld" by deleting the word "external" f rom the title and delet ing the last half of the first sentence, to read as follows:

Cont inuous Weld. A metal jo in ing me t hod without interrupt ion as related to visibility and quality. For the purpose of the definition, it specifically includes the exhans t compa r t men t of hoods and welded joints of exhaust ducts, yet specifically does not include filter suppor t f rames or appendages inside hoods. Welding is a fabrication technique for jo in ing metals by hea t ing the materials to the point that they melt and flow together forming an un in te r rup ted surface of no less s t rength than the original materials.

Delete the word "external" f rom 3-5.2.1 so that the paragraph reads ,as follows:

3-5.2.1 All seams, joints , penetrat ions, and duct to hood collar connect ions shall have a l iquidtight cont inuous weld•

Two exceptions and Figure 3-5.2.1 cont inue as in current edition of NFPA 96. SUBSTANTIATION: 2rt]e commit tee realized that external welding is no t always the best wa 7 and decided that an internal weld that is fo rmed smooth, or g round smooth , is the better option if a duct weld is h idden against a wall or otherwise cannot be easily inspected. External welding can also somet imes leave the internal side of the weld rather j agged or rongh. COMMITTEE ACTION: Accept.

(Log # 87) 96 - 11 - ( 1-3.1. l ): Accept in Principle SUBMITTER: Phil Ackland, Commercia l Vent Cleaning Co. Ltd RECOMMENDATION: Add the word "fans" so section reads as follows:

1-3.1.1 MI solid cooking equ ipmen t shall be served by hoods, ducts and fans that are separate from all o ther cooking exhaus t systems. SUBSTANTIATION: This was the intent of the proposal submit ted at the last cycle, but the word fans was missed. The present wording allows for the duets of the separate systems to be connected directly above the hood serving "normal" cooking needs, negat ing the in tent of the separat ion for satety that was implied in the text. COMMITTEE ACTION: Accept in Principle• Revise 1-3.1.1 as foil o w s :

1-3.1.1 All solid fuel cooking equ i pmen t shall camplywi th the requi rements of Chapter 11. COMMITTEE STATEIVIENT: The commit tee developed a new Chapter 11 to address all aspects of solid fuel cooking appliances and revised 1-3.1.1 to reference that chapter. See 96-93 (Log#113).

(Log # 68) 96 - 14- (14.2, 1-3.2 Exception 3 & 4 and Note): Accept in Principle SUBMITTER: Michael A. O'Hara, Thermal Ceramics RECOMMENDATION: Revise text to read as follows:

1-3.2 Exception No. 3: Clearance to limited combustible and combustible ~ materials may be reduced to zero clearance when protected by . . . . . . p . . . . . . • ; "" ,J

materials and products that are listed for the purpose of reducimz clearance. These materials shall be installed in accordance with the 'condi t ions of the listing and manufac tu re r ' s instructions. an..~d acceptab!e to tl2e antllorityR]avingju.risdiction., . . . . . .

g ~ l ~ l l v v v , l t i i ~ l v ~ l l ~ l i t i u l l ~ ~ 1 u i v l i o t i t l ~ g l l k t l i i g l J t i t g v t L l i v i 3

NOTE: The protect ion me thods for ducts to reduce clearance are to be applied to the combustible or l imited combustible conslnic-

- m l 1 • i i • , | • 1 . . t . non and r r ~ to file d u e l . . . . . . . . . . . ~ ' ~ " ' ~ ~ . . . . . V V . . . . . . . . . 7 - = t • ~ t , | • . , • . • • 1 . r

i,~¢..dcd. I,, ~ , c ofa~,~,~ ,q, c, d,c dac~ a~ay f~il. A duct may contact noncombust ib le floors, interior walls, and other noncombus - tible structures or supports , but it may not be in contact with these for more than 50 percent of its surface area per each lineal foot of contact length except when the duc t is nrotected with a material or product listed for the purnose of reducfng clearance to zero.

NOTE: "Support ing material is available for review at NFPA Headquarters ." SUBSTANTIATION: The proposed change combines Exceptions 3 and 4, adds per formance based language while delet ing prescriptive language and still mainta ins t i e code 's intent. I ndepende n t third party fire testing and compliance evaluation of direct applied to the duct of ceramic fiber insulation verified the integrity of the enclosure is main ta ined and the duct still operational when subjected to the t ime tempera ture exposures of proposed UL s tandard 1978 as out l ined in the fact f inding mission executive summary conducted by UL and ASTM E 119 t ime tempera ture curve and hose stream. These tempera tures are consistent with those exper ienced dur ing the UL 300 ex t ingu i shment system test and listings (1000-1600°F). Unde r these methods , material per formance is quantified, benchmark criteria set and per formance targets established, opposed to the cur rent prescriptive language in the code. which very well may accomplish the desired results, however, lacks the necessary follow up service or analytical quality control measures for die application. COMMI'VrEE ACTION: Accept in Principle.

Revise 1-3.2 Exception 3 and Note as 1-3.2 Exception and new 1- 3.2.1, as follows:

241

N F P A 9 6 ~ F 9 3 T C R

Exception No. 3: Clearance to l imited combustible materials shall be permit ted to be reduced to zero clearance when protected by metal lath and plaster, ceramic tile, quarry tile, or materials a n d products that are listed for the purpose of reduc ing clearance and acceptable to the authori ty having jurisdiction. The listed materials shall be installed in accordance with the condit ions of the listing and the manufac tu re r ' s instructions, and acceptable to the authori ty having jurisdict ion.

Delete Exception No. 4. 1-3.2.1 The protection me thods for ducts to reduce clearance are

to be applied to the combust ible or l imited combustible construc- t ion and no t to the duc t unless the listed material is directly applied to the duct in accordance with the condit ions of the listing and the manufac ture r ' s instructions. A duct shall be permi t ted to contact noncombust ib le floors, interior walls, and o ther noncombust ib le structures or supports , bu t it shall no t be in contact with these for more than 50 percent of its surface area per each lineal foot of contact length except when the duc t is protected with a material or product listed for the purpose of reduc ing clearance to zero. COMMITrEE STATEMENT: Commit tee agreed with the submit- ter, bu t felt it impor tan t to mainta in references to o ther materials (ceramic tile, quarry tile, etc.).

(Log # 33) 96 - 15 - (1-3.2, 1-3.2 Exception No. 1): Reject SUBMITTER:James T. Otenbaker, Nat'l Assoc. of Ventilator Mfrs. RECOMMENDATION: Delete reference to "grease extractors" to read:

"1-3.2" Clearance. Hoods, gr . . . . . ~ ,~ t . . . . and d u c t s . . . Al~p endix A."

evise Exception No. 1 to read: "When the hood or duct ~, ~ . . . . . . h , ~ , is listed for lesser

clearances." SUBSTANTIATION: "Grease Extractors" men t i oned in NFPA 96 as a listed device which was a UL produc t category is no longer available. In a recen t change, based on the industry 's a n d others ' input, UL inc luded these products with other exhaus t hood categories. Also, please refer to my proposal on Section 1-2 "Definitions" for addit ional substant iat ion to delete reference to

rease extractors." MMrI'rEE ACTION:Reject.

COMMITrEE STATEMENT: See Commit tee Action and Commit- tee Sta tement on 96-4 (Log #32).

(Log # 67) 96 - 16 - (1-3.2 Exception No. 2 Table & Figure A-1-3.2(f)): Accept SUBMITTER: Michael A. O 'Hara , The rma l Ceramics RECOMMENDATION: Revise text to read as follows:

Type of Protection Clearance to Combust ible Material (b) 0.027 in. (0.69 mm) (22 gage) shee t metal on 1 in. 3 in. (76.2 ram)

(25-mm) mineral wool bats or ceramic fiber blanket reinforced with wire mesh or equivalent spaced out 1 in. (25.4 mm) on noncombus t ib le spacers. As a result of the Table change, revise figure A-1-3.2(f): see sketch

as shown which adds the wording reflecting the above change: ceramic fiber blanket

See Figure A-1-3.2(0 on nex t page. SUBSTANTIATION: Technical data indicates the ceramic fiber blanket is at least equivalent to the mineral wool bat prescribed. Both materials are noncombus t ib le and the thermal conductivity values reflect the insulative qualities. Ceramic fiber blanket can be hand led in the same m a n n e r as prescribed by cur ren t code text.

NOTE: "Support ing material is available for review at NFPA Headquarters . ' COMMITrEE ACTION: Accept.

(Log # 50) 96 - 17- (1-3.5 (New)): Reject SUBMITTER:Joseph N. Knapp, McDonald ' s Corp. RECOMMENDATION: Add a new Section 1-3.5 as follows:

"It shall no t be cons t rued that a "listing" or "label" of any type, nor a s ta tement of "complies with NFPA 96" by any agency, whe ther on existing or new equipment , actually assures equivalency with this s tandard in the unde r s t and ing of this committee, irrespective of such claims. It is dae responsibility of the authori ty having jurisdic- tion to make such specific evaluations."

SUBSTANTIATION: To clarify the false impression that every "listed" or "labeled" product that claims equivalency with riffs s tandard, has actually achieved such in d-re unders tand ing of the committee. COMMITTEE ACTION: Reject. COMMrrrEE STATEMENT: The definition of labeled and listed means that it is the authori ty havingjur isdic t ion 's acceptance of the listing mark or label.

(Log # 88) 96 - 18 - (2-1 or 2-4.1): Reject SUBMITTER: Phil Ackland, Commercia l Vent Cleaning Co. Ltd RECOMMENDATION: In Chapter 2 add 2-1 or 2-4.1 Installation of "Listed Hood Assemblies" (or Listed Exhaus t Hoods with Exhaust Dampers) shall be installed by persons properly t ra ined and qualified to install the specific system being provided.

The installer shall certify to the Authori ty Having Jurisdiction that the installation is in complete compliance with the t e rms of the listing and the manufac ture r ' s instructions a n d / o r approved design.

The installer is required to provide the Authori ty Having Jurisdic- tion with a copy of the Initial Start-up Certificate, prior to an occupancy permit being issued.

NOTE: It is r e c o m m e n d e d that such training and qualification be by the manufac tu re r of the equ ipmen t be ing installed. SUBSTANTIATION: This proposal is taken f rom wording at 7-4.2 which relates to Fire Extinguishers. With the increasingly complex Hoods and Pollution Control Devices available on the market today it is impor tan t tha t individuals who install t h em are accountable to see that they are installed properly. The onus of this responsibility should rest with the manufacturers . Fire ext inguishers are no longer the only componen t s of ki tchen exhaus t systems which need to be reviewed and certified. COMMITTEE ACTION: Reject. COMMITrEE STATEMENT: The commit tee believes that no single installer is responsible for the installation of listed h o o d assemblies and the concept is no t equivalent to ext inguishing e q u i p m e n t as int imated by the submit ter ' s substantiation.

(Log # 19) 96 - 19 - (2-1.1 Exception): Accept in Principle SUBMITTER: Philip Morton, NAFEM RECOMMENDATION: Change the except ion as follows:

Hoods c.i E.,.l..~u, ~ ..f L~st~d Ex~actv, o or Listed Aut..;~,..G~ D...~.. . , . . . d II..~d , ~ c . , -

Exhaust Hoods Wi thout Exhaust Damoers evaluated u n d e r the same condit ions of fire severity ~ d,~ h v v d ' v . . . . . 1 . . . . . . ~" ii~c~d grc . . . . z, ~G.,~,~, as Listed Exhaust Hoods With Exhaust Dampers, shall be considered as complying with material and construct ion requi rements of 2-1.1 and 2-1.2. SUBSTANTIATION: The test s tandard for commercial exhaust hoods is U.L. S tandard 710. U.L. issued a revised s tandard (fourth edition) on December 21, 1990. Concur ren t with the revised s tandard U.L. changed the titles and the n u m b e r of categories of hoods. Previous categories, "Grease Extractors" and "Automatic Damper and Hood Assemblies" have been combined into one category titled "Exhaust Hoods With Exhaust Dampers." Previous category "Classified Hood" has been changed to "Exhaust Hood Without Exhaust Damper." Revising the exception will make it consistent with the revised U.L. titles. COMMITI'EE ACTION: Accept in Principle.

Add "or without" between "with" and "exhaust dampers" and delete everything after that th rough "exhaust hoods with exhaust dampers" so that revised exception reads as follows:

Exception: Listed exhaust hoods with or without exhaust dampers shall be considered as complying with material and construct ion requi rements of 2-1.1 and 2-1.2. COMMITTEE STATEMENT: Commit tee revised text to make die exception consistant with the new listing categories.

242

N F P A 96 - - F 9 3 T C R

l e to r ia l

~oo l bait or er blanket

1 " Non(: spacer

i t me ta l

Plan sec t ion

1'" N o n c o m b u s t i b l e spacer - such as s tacked w~ldlers, Small d i l lme te r pipe. Tub ing , o r e lec t r ica l c o n d u i t

• I

Nai l o r screw

mate r ia l

/

\

\ 1" Noncombus t~b lo , spacer

,, / ~ /

/

\

/

/

---..z.._

--..q

v

22 Ga. sheet me ta l

W i r e mesh

3 " ~ -

Side sec t ion

3 " 1" Mineral woo l ba~t or ceram/c t iber blanket

24S

N F P A 96 1 F 9 3 T C R

(Log # 34) 96 - 20 - (2-1.1 Exception): Accept in Principle SUBMITTERzJames T. Otenbaker , Mt Pleasant, MI RECOMMENDATION: Revise the Exception to read:

"Exception: I 1 0 6 ~ ~, c,,clo~;~-c~ 6 f l ~ t cd g, co~C cxz;acz,,,~ ,,,

+ + l l l ~ L ~ L J U I ~ L l O ~ L I l l % O L V ~ i l ~ 7 m U l ~ t l ~ q l b i l b l q + U l g v i ~ o L ~

g, c,~,c cxt , , ,c~,s , Listed exhaus t hoods with 0~ without exhaust damoers comnlvin~ with reou i rements of Standard UL 710. Exhaust Hoocl for Comrner';zial Cook'in~ Eau inment . shall be cons ide red . . . and 2-1.2." SUBSTANTIATION: Recently, UL has revised terminology of its exhaust hood categories based on the industry 's and others ' input. Grease extractors and automat ic dampe r and hood assemblies are now covered u n d e r "Exhaust Hoods With Exhaust Dampers." "Exhaust Hoods Wi thout Exhaust Dampers" are basically evaluated using the same requi rements for previous grease extractors for their material and construction. The requ i rements for both these types of hoods are included in UL 710, which is an industry-accepted and widely recognized Standard and is also referenced in model codes and local codes. Definit ion of "Listed" equ i pmen t indicates that "Listing" means "meet ing appropriate s tandards or tested and found suitable for use in a specified manner . " Referencing UL 710 will fulfill the in tent inhe ren t in this exception. COMMITTEE ACTION: Accept in Principle. COMMITTEE STATEMENT: See Commit tee Action on 96-19 (Log #19).

(Log # 10) 96- 21 - (2-1.1 Exception 2-1.2 Exception; 3-5.2.1; 6-2.4; 7-1.1; 8-1.5): R~)B ect

MITTER: George Levenback, Studio City,CA RECOMMENDATION: All men t i on of "Listed Grease Extractor" should be changed. U.L. Listing unde r Standard 710 is no longer titled "Grease Extractors for Exhaust Hoods." The new title is "Exhaust Hoods for Commercia l Cooking Equipment ." SUBSTANTIATION: Allowing exceptions for Listed Grease Extractors is no longer valid since there are no Listed Grease Extractors. The December , 1990 UL Standard 710 specifically states in paragraph 1.7 that the requ i rements for Listing do not cover evaluation with respect to grease extraction efficiency. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: No specific r e commenda t i on was submitted, however the p rob lem has been dealt with in o ther proposals.

(Log # 20) 96 - 22 - (2-1.2 Exception No. 1): Accept in Principle SUBMITTER: Philip Morton, NAFEM RECOMMENDATION: Change the exception to read as follows:

Exception No. 1: Penetrat ions shall be permi t ted to be sealed by other listed devices that are evaluated u n d e r the same condit ions of fire severity as d,~ L ~ d *,r ~'~d . . . . . . ,~ listed g,',. . . . . t~ ~-t,~, o Exhaust Hoods With Exhaust Dampers and whose presence does no t detract f rom the hood ' s or duct ' s structural integrity. (See definition of cont inuous external weld in Section 1-2.) SUBSTANTIATION: The test s tandard for commercial exhaus t hoods is U.L. Standard 710. U.L. issued a revised s tandard (fourth edition) on December 21, 1990. Concur ren t with the revised s tandard U.L. changed the titles and the n u m b e r of categories of hoods. Previous categories, "Grease Extractors" and "Automatic Damper and Hood Assemblies" have been combined into one category dried "Exhaust Hoods With Exhaust Dampers." Previous category "Classified Hood" has been changed to "Exhaust Hood Without Exhaust Damper." Revising the exception will make it consistent with the revised U.L. rifles. COMMITrEE ACTION: Accept in Principle.

Delete "other" before "listed devices"; delete the reference to "exhaust hoods with exhaus t dampers" , and delete the reference to cont inuous external weld so that revised exception reads:

Exception No. 1: Penetra t ions shall be permit ted to be sealed by devices listed for such use and whose presence does not detract f rom the hood ' s or duct ' s structural integrity. COMMITTEE STATEMENT: Better reflects the submit ter ' s intent.

(Log # 35) 96 - 23 - (2-1.2 Exception No. 1): Accept in Principle SUBMITTER: James T. Otenbaker , Nat'l Assoc. of Ventilator Mfrs. RECOMMENDATION: Revise Exception No. 1 to read:

"Exception No. 1: Pene t r a t ions . . . are evaluated ~ , d ~ , tLc . . . . . .

extrnet~-s to comolv with anolicable reau i rements in Standard UL 710, Exhaust Hoo'ds for Colt{mercia] Cdoking Equ ipment and whose

~ r e s e n c e . . . ( . . . Section 1-2.)" UBSTANTIATION: Appropriate fire test requi rements which are

similar to those used for listed grease extractors have been included in Fourth Edition (dated December 21, 1990) of UL 710 to evaluate devices in t ended to seal penet ra t ions made in a hood or duct. COMMITrEE ACTION: Accept in Principle. COMMITTEE STATEMENT: See Commit tee Action on 96-22 (Log #20).

(Lo g # 21) 96 - 24 - (2-1.2 Exception No. 3 (New)): Accept in Principle SUBMITTER: Philip Morton, NAFEM RECOMMENDATION: Add a new Exception No. 3 to read as follows:

"Hoods over gas or electric ovens may have a duct f rom the oven flue(s) connec ted to the h o o d canopy." SUBSTANTIATION: It is c o m m o n for eyebrow style hoods installed over large baking ovens to have the oven flue duc t connec ted into the hood canopy allowing flue gases to be drawn into the filter or grease extractor and up the exhaus t stack. This technicallyviolates 2-1.2 because the duct penetra tes the hood. Since ovens are not generally considered to create a fire hazard I feel that penetra t ion uf the hood with a flue duc t should be allowed.

[ I

/ ~T FLUE

~ F L U E

- ~ / ~c~ ~ J I / , /

TYPICAL SECTION OF EYEBROW STYLE HOOD

244

N F P A 96 ~ F 9 3 T C R

COMMITTEE ACTION: Accept in Principle. Substitute "shall be permi t ted for "may" and add a second

sentence so tha t new Exception reads as follows: Exception No. 3: Hoods over gas or electric ovens shall be

permit ted to have a duc t f rom the oven flue(s) connec ted to the hood canopy. The duct shall be connec ted to the hood with a cont inuously external weld. COMMITrEE STATEMENT: The commit tee elaborated on the r ecommenda t ion to more clearly define the use of equipment .

(Log # 51 ) 96 - 25 - (2-1.2 Exception No. 4 (New)): Accept in Principle SUBMITTER:Joseph N. Knapp, McDonald ' s Corp. RECOMMENDATION: Add a new Exception No. 4 as follows:

Exception No. 4: Seams, joints, and penet ra t ions of the hood can be internally welded provided that the weld is fo rmed smooth, or g r o u n d smooth so as to not trap grease, and be readily cleanable. SUBSTANTIATION: Most hoods are welded externally, and g r o u n d smoo th for appearances sake. But that somet imes causes quest ions on hoods where the welding is h idden against the wall or by some other piece of equipment , so the jo ints canno t also be easily inspected. External welding can also somet imes leave file internal side of the weld ra ther j agged or rough. COMMITTEE ACTION: Accept in Principle.

Substitute "shall be permi t ted to" for "can" so the revised exception reads as follows:

Exception No. 4: Seams, joints, and penet ra t ions of the h o o d shall be permi t ted to be internally welded provided that the weld is fo rmed smooth, or g r o u n d smoo th so as to not trap grease, and be readily cleanable. COMMITTEE STATEMENT: Editorial change.

(Log # 81 ) 96 - 26 - (2-2, 5-2.2): Reject SUBMITTER: J o h n K. Bouchard, SedgwickJames of N.E. RECOMMENDATION: Add asterisks following 2-2 and 5-2.2 to indicate explanatory material on those paragraphs in Appendix A.

Add the following appendix note to Appendix A: A-2-2 The design of a hood and exhaus t system requires the

analysis of a larger system involving such variables as source of energy, products processed, room air movement , equ i pmen t unde r hood, t empera ture of kitchen, location of make-up air and filters, etc. The following references address design considerat ions for hoods and exhaus t systems:

(a) Application Handbook HVAC Applications, 1991 Edition, Amer ican Society of Heating, Refrigeration and Air Condi t ioning Engineers (ASHRAE).

(b) Industrial Ventilalion, Commit tee on Industrial Ventilation, American Conference of Governmenta l Industrial Hygienists.

(c) Plant and Process Ventilation. A-5-2.2 See A-2-2.

SUBSTANTIATION: To provide some direction to someone who thinks NFPA 96 will provide specific air volume requirements , size of hood, he igh t above floor, dep th of hood, etc. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: References are obsolete and do not refer to fire safety requirements .

(Log # 22) 96 - 27 - (2-3.1.2): Accept in Principle SUBMITTER: Philip Morton, NAFEM RECOMMENDATION: Beginning with the second sentence of 2- 3.1.2, revise as follows:

"The d a m p e r shall be ~ . . . . t, u~t~d v~ ~ l ~ t ~.~ o~,..~ ~ ~ d,~ listed for such use or be har t of a Listed Exhaust Hood With

Exhaust Damper or Listed Ex[laust Hood Wi thout Exhaust Damper." The remaini 'ng por t ion of the paragraph to remain unchanged"

SUBSTANTIATION: The cur rent wording would allow any type of un tes ted dampe r to be used. Requir ing a listed dampe r would assure that the d a m p e r would operate as intended. COMMITTEE ACTION: Accept in Principle.

Retain the gage thickness r equ i r emen t and add "or without" after "with", delete "or listed exhaus t hood without exhaus t damper" so that revised sen tence reads:

The dampe r shall be constructed of at least file same gage as the shell and listed for such use or be part of a listed e x h a u s t h o o d with or without exhaus t damper . COMMITTEE STATEMENT: Commit tee chose to retain the gage thickness r equ i r emen t and to make minor editorial revisions.

(Log # 14) 96 - 28 - (3-1 (New)): Reject SUBM][TTER: Harold Schoendorf , FL Assoc. of Plumbing, Gas & Mechanical Inspectors Inc. RECOMMENDATION: Add new text as follows:

"Radius elbows shall be used on exhaus t ducts." SUBSTANTIATION: Square throat elbows can only be used in air ducts with a m a x i m u m velocity of 1000 FPM. (Per SMACNA - HVAC Duct Construct ion Standards - Metal and Flexible) Kitchen exhaust ducts require a m i n i m u m velocity of 1500 FPM.

w'4

TYPE RE 4 SQUARE THROAT ELBOW

WITHOUT VANES (1000 FPM MAXIMUM VELOCITY)

NOTE: "Support ing material is available for review at NFPA Headquarters ." COMMITrEE ACTION: Reject. COMMITTEE STATEMENT: Commit tee felt the SMACNA HVAC duct construct ion s tandards material was not appropria te for grease duct construction.

(Log # 89) 96 - 29 - (3-1 (New)): Reject SUBMITTERa Dave Russel / Phil Ackland, Commercia l Vent Cleaning Co. Ltd RECOMMENDATION: Add the following new text:

3-1o? Duct Elbows. All Elbows shall have a throat radius of at least 1 /3 to 1 /2 the duct width (i.e., a 6 in. throat radius on a 12 in. to 18 in. duct) . SUBSTANTIATION: The reason for this is that far more grease is d ropped at a tu rbu len t direction change (square cornered turn) than a smoo th direction change (curved cornered turn) . Also, radius elbows reduce the static resistance, significandy lowering the horse power r equ i r emen t of the fan mad making the balance of multiple hoods possible without the use of balancing dampers . COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: See Commit tee Sta tement on 96-28 (Log #14).

245

NFPA 96- - F93 TCR

(Log # 52) 96 - 30 - (3-1.2): Accept SUBMITTER:Joseph N. Knapp, McDonald's Corp. RECOMMENDATION: Change the sentence to read:

"All ducts shall lead as directly as is practical to the exterior of tile building, so as to not unduly increase any fire hazard." SUBSTANTIATION: To remove the possibility of local enforcement of the most direct ~ path to outside, without consideration of unreasonable costs involved, when there is no undue increase in fire hazard involved in the more practical and reasonable path. COMMITTEE ACTION: Accept.

(Log # 53) 96 - 31 - (3-1.4): Accept SUBMITTERaJoseph N. Knapp, McDonald's Corp. RECOMMENDATION: Add the followingsentence to 3-1.4:

"In manifold systems, the lowest end of the main duct shall be connected flush on the bottom with the branch duct." SUBSTANTIATION: To emphasize the need to not form traps, by addressing one of the more common traps that occurs in manifold systems when all branch ducts are taken off 1 in. or more above the bottom of the main duct. COMMITTEE ACTION: Accept.

(Log # 66) 96- 32- (3-3.2): Accept in Principle SUBMITTER: Bruce Zimmerman, NAFEM RECOMMENDATION: Revise text to read as follows:

For t+~tee~ hoods with dampers in the exhaust ~ collar, an access panel for cleaning and inspection shall be provided in the duct or hood collar. This panel shall be a~s close to the hood as possible but not exceed 18 in. (457.2 mm).

Exception: Dampers that are accessible from the duct entry at the hood. SUBSTANTIATION: Most hoods with dampers have sufficient access for inspection and cleaning from under the hood. Supply hoods shouldalso have sufficient access. COMM1TI"EE ACTION: Accept in Principle.

Change exception to read "under the hood" instead of "tile duct entry at dae hood", as follows:

Exception: Dampers that are accessible from under the hood. COMMITTEE STATEMENT: Committee felt the revised language more clearly identified the duct entry at the hood.

(Log # 91 ) 96 - 34 - (3-5 (New)): Accept in Principle SUBMITTER: Phil Ackland, Commercial Vent Cleaning Co. Ltd RECOMMENDATION: Add tile following new material to 3-5.? as follows:

3-5.? Horizontal ducting must be secured sufficiently to allow for tile weight of personal entry into the duct. SUBSTANTIATION: Where duct work needs to be crawled through to be cleaned the ducting must be attached well enough to the ceiling above to insure against collapse from the weight of a titan. This fastening will also insure the welds will not break if the building settles. COMMII"rEE ACTION: Accept in Principle. Add the recommended language to 3-3.4.1 as a new second

sentence so that revised 3-3.4.1 reads as follows: 3-3.4.1 On horizontal ducts at least one 20 in. x 20 in. (508 m m x

508 ram) opening shall be provided for personnel entry'. Horizontal ducting must be secured sufficiently to allow for the weight of personal entry into the duct. Where an opening of this size is not possible, openings large enough to permit thorough cleaning shall be provided at 12-ft (3.7-m) intervals. COMMITTEE STATEMENT: Committee felt the requirement belonged in 3-3.4.1.

(Log # 90) 96 - 35 - (3-1.5): Accept in Principle SUBMITTERa Phil Ackland, Commercial Vent Cleaning Co. Ltd RECOMMENDATION: Replace the word "ducts" with the word "systems." to read as follows:

1. 3-1.5 (1-3 see below) All interior surfaces of the ~ shall be accessible for cleaning and inspection purposes.

2. Editorial Comment: Move 3-1.5 to General Requirements 1-3. SUBSTANTIATION: 1. The word "ducts" is too narrow. The entire system needs to be accessible, including the hoods and the fan.

2. Better reflects the intent of the statement. This is a general requirement of the entire system not just related to ducts. COMMII'I'EE ACTION: Accept in Principle.

Revise first sentence of 3-1.5 ,as recommended, adding "exb/tust" before "system" and "reasonably" before "access" and move first sentence to 1-3.1.3, as follows:

1-3.1.3 All interior surfaces of the exhaust system shall be reasonably accessible for cleaning and inspection purposes.

Second sentence of 3-1.5 remains as 3-1.5as follows: 3-1.5 Openings required for accessibility shall comply with Section

3-3. COMMITTEE STATEMENT: Minor editorial changes, committee felt that only tile first sentence belonged in Chapter 1.

96 - 33 - (3-3.3): Reject (Log# 9) SUBMITTER; David Winston Addison, Penn Ventilator Co. RECOMMENDATION: Delete Section 3-3.3 as follows:

"Exhaust fans with ductwork connected to botll sides shall have access for cleaning and inspection within 3 ft (0.92 m) on each side of the fan." SUBSTANTIATION: Section 3-3.3 of NFPA 96, 1991 edition, introduces the opportunity to use an inline fan to exhaust grease- laden flmles. Ally roof-mounted unit will not require ductwork on each side of the unit and would imply an in-duct fan can be used. However, section 6-3 in tl~e same standard states, "Other Eouipment • Fume incinerators, thermal recovery units, air pollution control devices, or other devices shall be permitted to be installed in ducts or hoods or located in the path of travel of exhaust products when specifically approved for such use and shall not increase the fire hazard. . ." . There hasn' t been any clarity given concerning the use ofinline fans in kitchen applications. I was unable to locate in the standard anydfing which reflects an approval or denial of this use. COMMI'ITEE ACTION: Reject. COMMITTEE STATEMENT: Inline fans are and have been permitted in commercial cooking exhaust systems. See also Committee Proposal on Inline fans, 96-59 (Log #104).

(Log # 54) 96 - 36 - (3-5.2.1): Accept in Principle SUBMITTER:Joseph N. Knapp, OakbrookjL RECOMMENDATION: Add a new Exception No. 3 ,as follows:

"Internal weld shall be permitted at collar and duct connections within 2 ft. of tile hood and the exhaust fan to facilitate access and quality. . of weld, provided the j'oint is formed or ground smooth, and is readdy accessible for inspection." SUBSTANTIATION: Oftentimes connections at tile hood and exhaust fan are too close to a wall or chase or curb and are not readily accessible from the outside, such that a good quality weld cannot be made. It is far better to weld from tile inside in these limited cases that are readily inspected, than to weld poorly, or not at all, on the outside. COMMITrEE ACTION; Accept in Principle.

Delete everything between "permitted" and "provided" so that new exception reads as follows:

Exception No. 3: Internal weld shall be permitted provided the joint is formed or ground smooth and is readily accessible for inspection. COMMITTEE STATEMENT: Committee felt that other accessible locations for internal welding should be allowed.

246

N F P A 9 6 - - F 9 3 T C R

(Log # 56) 96 - 37 - (3-5.2.1, Exception No. 2): Accept in Principle SUBMITTER: James T. Otenbaker, Nat'l Assoc. of Ventilator Mfrs. RECOMMENDATION: Revise Exception No. 2 to read:

"Ex.ceptionNo. 2: Penetrations,... are evaluated ,.,.~,.: d.~. ~.~c

to comnlv with annlicable reauirements in Standard UL 710. Exhaust Hoo'ds for Co~r~mercial Cookin~ Eouioment and whose

. .

~ r e sence . . . integrity." UBSTANTIATION: Please refer to Substantiation in my proposal

for paragraph 2-1.2, Exception No. 1. COMMITTEE ACTION: Accept in Principle. COMMITrEE STATEMENT: See Committee Action on 96-22 (Log #20).

(Log # 55) 96 - 58 - (3-5.2.2): Accept SUBMITTER: Joseph N. Knapp, McDonald's Corp. RECOMMENDATION: Add a newSection 3-5.2.2as follows:

"Overlapping duct connections of either the telescoping or bell type shal/be used for welded field joints, not butt weld connections. The inside duct section shall always be uphill of the outside duct section. The inside dimensions of overlapping sections shall not exceed 1/4 in. The overlap shall not exceed 2 in." SUBSTANTIATION: Butt weld connections in the field are virtually impossible to properly align, and to weld in a grease tight manner. The simple telescopinl { and bell joints which overlap are the most practical for field welding, guaranteeing both alignment and the ease of a grease tight joint. With the smaller duct inside, the natural drain is downward. The inverted joint overlap cannot trap grease of any quantity for concern. COMMITTEE ACTION: Accept.

(Log # 25) 96 - 39 - (3-6.1): Accept SUBMriq'ER: PhilipMorton, NAFEM RECOMMENDATION: Change the last sentence of the paragraph to read as follows:

"Clearance of any vertical or horizontal ducts Z . . . . . . b.odblc shall comply with 1-5.2.

SUBSTANTIATION: The existing wording does not cover limited or non combustibnle material. Removal of the words "to combustible material" would eliminate possible confusion of clearance require- ments for limited and non combustible. COMMITTEE ACTION: Accept.

(Log # 56) 96 - 40 - (3-7.1): Accept in Principle SUBMrITER: Joseph N. Knapp, McDonald's Corp. RECOMMENDATION: Change the section to read as follows:

"In all buildings more than one story in height, and in one-story buildings where the roof, or roof-ceillng, or floor or floor-ceiling assembly is (or assemblies are) requiredto have a fire resistance rating, the ducts shall be enclosed in a continuous enclosure extending minimally from the lowest rated structure above the hood to or through the roof, so as to maintain the integrity of the fire separations required by the applicable building code provisions. The enclosure shall be sealed around the duct at its bottom end, and vented to the exterior of the building through weather protected openings. The enclosure shall conform to the following:" SUBSTANTIATION: To emphasize the importance of the chase going from the lowest rated structure to the roof, and closing the chase at its bottom, which may or may not be a ceiling location as mentioned in the original. Since a continu9~ enclosure is called for, it is not necessary to comment on its passage through concealed

~ ( ~ I I T T E E ACTION: Accept in Principle. COMMITTEE STATEMENT: See Committee Action on 96-42 (Log #82).

(Log # 69) 96 - 41 - (3-7.1): Accept in Principle SUBMITTER: Michael A. O'Hara, Thermal Ceramics RECOMMENDATION: Revise text to read as follows:

"3-7.1 . . . The enclosure shall be sealed around the duct at the Oint of penetration at the floor-ceiling (see NFPA 101 Safety. to Life om Fire in Buildintrs and Structures~ and vented.. .".

SUBSTANTIATIONS." This makes the code section consistent with wording in figure A-1.3.2 (d).

NFPA 101 has specific requirements for penetrations in both tile body of the code text in Chapter 0 and the appendix, which essentially follows the BCMC language for protection of penetrations and annular space around duct penetrations. In addition, the three model building codes have specific requirements for through penetrations, and this subtle change provides additional consistent guTidance to the user of this code.

here are UL Classified systems for the protection of grease duct penetrations through construction assemblies in accordance with UL 1479/ASTM E 814, Standard Method of Fire Tests of Through Penetration Fire Stops.

In a test conducted at UL, a grease duct through penetration insulated with direct applied ceramic fiber blanket, maintains its F and T rating for 5 hr concludingthe temperature transmission through the penetration stayedbelow 325°F plus ambient, prevented flame penetration and passed the water hose stream.

NOTE: "Supporting material is available for review at NFPA Headquarters." COMMITTEEACTION: Accept in Principle. COMMITrEE STATEMENT: See Committee Action on 96-42 (Log #82).

(Log # 82) 96 - 42 - (3-7.1): Accept in Principle SUBMITTER:John K. Bouchard, SedgwickJames of N.E. RECOMMENDATION: Revise 3-7.1 to read as follows:

3-7.1 In all buildings more than one storyin height, and in one- story buildings where the roof or roof-ceiling assembly is required to have a fire resistance rating, the ducts shall be enclosed in a continuous enclosure extending from ~ ceiling or floor above the hood, through any concealed spaces, to or through flae roof so as to maintain the integrity of the fire separations required by the applicable building code provisions. The enclosure shall be sealed around the duct at the point of penetration of a fire rated ceiling of floor above the hood and vented to the exterior of the building through weather protected openings. The enclosure shall conform to the following: SUBSTANTIATION: Tlie text in 3-7.t does not match the situation shown in figure A-l-$.2(d) with a non-fire-rated ceiling and a fire rated floor. Recommendation is to have text describe all situations in all figures A-l-$.2(a) through (d). COMMITTEE ACTION: Accept in Principle. Delete "roof or" from the first sentence, add "the lowest" before

"fire rated" in first and second sentences, and add "to maintain the fire resistance rating of the enclosure" following "above the hood" in the second sentence so that revised 3-7.1 reads as follows:

5-7.1 In all buildings more than one storyin height, and in one- story buildings where the roof-ceilingassembly is required to have a fire resistance rating, the ducts shallbe enclosed in a continuous enclosure extending from the lowest fire rated ceiling or floor above the hood, through any concealed spaces, to or through the roof so as to maintain the integrity of the fire separations required by the applicable building code provisions. The enclosure shall be sealed around the duct at the point of penetration of the lowest fire rated ceiling or floor above the hood to maintain the fire resistance rating of the enclosure and vented to the exterior of the building through weather protected openings. The enclosure shall conform to the following: (paragraphs follow as in existing text) COMMITrEE STATEMENT: Language agrees with Figures A-1- 3.2(a) thru (d) and meets the intent of the submitter.

247

N F P A 9 6 - - F 9 3 T C R

(Log # 105) 96- 43- (3-7.1, 3-7.1 Exception(new), 3-7.2(new)): Accept SUBMITTER: Technical Commit tee on Vent ing Systems for Cooking Appliances RECOMMENDATION: Add a new exception to 3-7.1 following the second sentence. Make the third sentence of 3-7.1 a new 3-7.2, all as follows:

3-7.1 In all buildings more than one s tory in height , and in one- story buildings where the roof or roof-ceiling assembly is required to have a fire resistance rating, the ducts shall be enclosed in a cont inuous enclosure ex tending f rom the ceiling above the hood, th rough any concealed spaces, to or t h rough the roof so as to mainta in the integrity of the fire separat ions required by the applicable building code provisions. The enclosure shall be sealed a round the duct at the point of penet ra t ion at the ceiling and vented to the exterior of the bui lding th rough weather protected openings.

Exception: The cont inuous enclosure provisions of 3-7.1 are no t required where a duc t penet ra t ion is protected with a listed duct th rough penetra t ion protect ion system equivalent to the fire resistance rat ing of the assembly be ing pene t ra ted and the surface of the duct is enclosed on all side with listed materials and products and the materials are installed in accordance with the condit ions of the listing and the manufac tu re r ' s instructions and acceptable to the authori ty having jurisdiction.

3-7.2 The enclosure shall conform to the following: R e n u m b e r 3-7.1.1 to 3-7.2.1 and r e n u m b e r subsequen t paragraphs

and subsections. SUBSTANTIATION: In response to 96-44 (Log #70), the commit- tee added an exception to 3-7.1 to recognize test data submi t ted to the commit tee and new product listings. See also 96-44 (Log #70). COMMITTEE ACTION: Accept.

(Log # 70) 96 - 44 - (3-7.1.3): Accept in Principle SUBMITTER: Michael A~ O'Hara, The rma l Ceramics RECOMMENDATION: Revise the text to read as follows:

3-7.1.3 Clearance f rom the duct to the interior surface of enclo- sures of combustible construct ion shall no t be less than 18 in. (457.2 ram), and clearance f rom the duct to the interior surface of enclosures of noncombust ib le and l imited combustible construct ion shall no t be less t han 6 in. (152.4 m m ) . Provisions for reducing clearances as described in 1-3.2 Exception 3 are ~ applicable to enclosures if the materials or nroducts are listed for the Durnose of reducing clearance. SUBST.~,NTIATION: I n d e p e n d e n t third party tests conduc ted by UL as part of a fact f ind ing investigation for combustible and limited combustible construct ion at zero clearance indicate there are suitable me thods of main ta in ing the enclosure for a fire originating within the duct.

Two hr Fire Resistance Tests requi red of fire rated cont inuous enclosures as def ined in section 1-1 of NFPA 96, were conducted at O m e g a Point Laboratories per the t ime tempera ture curve and hose stream prescribed in ASTM E 119, Standard Method of Fire Tests of Building Construct ion and Materials. T he results indicate the enclosure a round the duc t prevents the passage of flames and ho t gases and mainta ins structural integrity with direct applied noncom- bustible materials. COMMITTEE ACTION: Accept in Principle.

Keep 3-7.1.3 text the same as in the cur ren t edit ion of NFPA 96. Move note following 3-7.1.3 to Appendix and add a new exception to 3-7.1.3 as follows:

Exception: Clearance f rom the duc t to the interior surfaces of enclosures of noncombus t ib le and l imited-combustible construct ion shall be permi t ted to be reduced to zero clearance when the surface of the duct is enclosed on all sides with listed materials and products and the materials are installed in accordance with the condit ions of the listing and manufac tu re r ' s instructions and acceptable to the authori ty having jurisdiction. COMMITTEE STATEMENT: Commit tee agreed with submitter , bu t chose to state r equ i rements as an exception. Meets the intent of the submitter.

(Log # 83) 96 - 45 - (3-7.1.3): Accept in Principle SUBMITTER:John K. Bouchard, SedgwickJames of N.E. RECOMMENDATION: R e n u m b e r 3-7.1.3 as 1-3.2.1 so that clearance to an enclosure is covered unde r 1-3.2 Clearance, and all clearance requ i rements will be in one section of the standard.

Add a new 3-7.1.3 that reads as follows: 3-7.1.3 Clearance between ducts and combustible materials shall be

~ rovided in accordance with the requi rements of 1-3.2. UBSTANTIATION: Clearance requi rements are in two places, in

Chapter 1 and in Chapter 3. This is confusing, as one would assume that 1-3.2 Clearance covers all situations. COMMITTEE ACTION: Accept in Principle.

Revise 1-3.2 to tide only, add "Except where enclosures are required" before existing text in 1-3.2.1, and add new 1-3.2.2 so that revised 1-3.2 reads as follows:

1-3.2 Clearance. 1-3.2.1 Except where enclosures are required, hoods, grease

extractors, and ducts shall have a clearance of at least 18 in. (cont inue text and all exceptions of existing 1-3.2).

1-3.2.2 For clearances between the duct and interior surfaces of enclosures, see 3-7.1.3. COMMITTEE STATEMENT: Commit tee chose to keep enclosure clearance requ i rements in Chapter 3 with new cross reference in Chapter 1. Meets the in tent of the submitter.

(Log # 112) 96 - 46 - (3-7.4): Accept SUBMITTER: Technical Commit tee on Venting Systems for Cooking Appliances RECOMMENDATION: Add a second sentence to 3-7.4 addressing mult iple ducts in an enclosure. Revised 3-7.4 will read as follows:

3-7.4 Each duc t system shall constitute an individual system serving only exhaust hoods on one foo r . Multiple ducts shall no t be permit ted in a single enclosure. SUBSTANTIATION: The commit tee is concerned with require- ments for mult iple ducts in a single enclosure and is soliciting r ecommenda t ions reflecting actual experience in the form of Commen t s to the Technical Committee. COMMITTEE ACTION: Accept.

(Log # 57) 96 - 47 - (3-8.3.2): Accept SUBMITTER:Joseph N. Knapp, McDonald 's Corp. RECOMMENDATION: Add the words "or operable door or window" following the existing words "air intake" in both sentences of this section. SUBSTANTIATION: To add two overlooked areas that migh t

~ ermit exhaust eff luent to be drawn back into the building, creating oth heal th and fire hazards.

COMMITrEE ACTION: Accept.

(Log # 92) 96 - 48 - (3-8.3.2): Accept in Principle SUBMITTER: Phil Ackland, Commercia l Vent Cleaning Co. Ltd RECOMMENDATION: In 3-8.3.2 remove or review the word "masonry" in the first sentence. SUBSTANTIATION: There are a n u m b e r of building materials used in construct ion besides masonry.

Additionally, the type of material used will need to have clearance requi rements a t tached to them. I have seen many wooden struc- tures with ducts r u n n i n g up the outside of the building at tached directly to the wall. COMMITTEE ACTION: Accept in Principle.

Change the word "masonry" to "noncombust ible" so that revised 3- 8.3.2 reads as follows:

3-8.3.2 T h r o u g h a noncombus t ib le wall with a m i n i m u m of 10 ft (3.05 m) of clearance f rom the outlet to adjacent buildings, property lines, grade level, combustible construction, electrical equ ipment or lines, and the closest point of anya i r intake at or below the plane of the exhaust termination. The closest point of any air intake above the plane of the exhaust te rminat ion shall be a m i n i m u m of 10 ft (3.05 m) distant, plus 0.25 ft (0.076 m) per each one (1) degree f rom horizontal, the angle of degree being measured f rom the center of the exhaus t te rminat ion to the center of the air intake. (See Figure 3-8.3.2.) COMMrrrEE STATEMENT: The commit tee could no t justify reducing the restriction to include all types of construction, but did agree that all noncombust ib le construct ion was acceptable.

248

N F P A 96 1 F93 T C R

(Log # 75) 96- 49- (3-8.3.7): Accept in Principle SUBMITTER:Joseph N. Knapp, McDonald ' s Corp. RECOMMENDATION: Add a new paragraph as follows:

"With the duc t protected f rom contact with a combustible wall in accordance with 1-3.2, and protected f rom possible corrosion in accordance with 3-6.2." SUBSTANTIATION: To emphasize the clearance from combustible and protect ion f rom corrosion that migh t be overlooked in this section. C O M M I T r E E A C T I O N : Accept in Principle. COMMITrEE STATEMENT: See Recommenda t ion and Commit- tee Action on 96-39 (Log #23).

(Log # 24) 96 - 50 - (4): Accept SUBMITTER: Philip Morton, NAFEM RECOMMENDATION: R e n u m b e r Chapter 4 to Chapter 3 and Chapter 3 to Chapter 4. SUBSTANTIATION: Posit ioning the cur rent Chapter 4 "Grease Removal Devices in Hoods" after Chapter 2 "Hoods" would be a more logical sequence. COMMITTEE ACTION: Accept.

(Log # 37) 96 - 51 - (4-1): Reject SUBMITTER: James T. Otenbaker , Nat'l Assoc. of Ventilator Mfrs. RECOMMENDATION: lnser t following new second sentence in this section before "Mesh f i k e r s . . , used."

"Listed grease filters shall comply with Standard UL 1046, Grease Filters for Exhaust Ducts." SUBSTANTIATION: Definition of "Listed" equ ipment indicates that "listing" m e a n s "meet ing appropriate s tandards or tested and found suitable for use in a specified manner . " Definition of"Grease Filter" describes a baffle-type grease filter. Many such filters are listed in accordance with UL 1046. Referencing UL 1046 will fulfill the in tent i nhe ren t in this Section. COMMITrEE ACTION: Reject. COMMITrEE STATEMF_aNT: Commit tee felt that existing language was sufficient and that r e commenda t i on referencing one product s tandard would limit o ther product standards.

(Log # 102) 96 - 52 - (4-2.1): Accept SUBMITTER: Technical Commit tee on Vent ing Systems for Cooking Appliances RECOMMENDATION: Add "but no t less than 18 in." to the end of the first sentence so that revised 4-2.1 reads as follows:

4-2.1 The distance between the grease removal device and the cooking surface shall be as great as possible, but not less than 18 inches. Where grease removal devices are used in conjunct ion with charcoal or charcoal-type broilers, including gas or electrically hea ted char-broilers, a m i n i m u m vertical distance of 4 ft (1.22 m) shall be main ta ined between the lower edge of the grease removal device and the cooking surface.

Two exceptions remain as in cur ren t edition. SUBSTANTIATION: The commit tee considered the first sentence of this subsection to be ambiguous and added a specific d imens ion for clarification. COMMITTEE ACTION: Accept.

(Log # 16) 96 - 53 - (4-2.1 Exception No. 2): Reject SUBMITTER: Larry Capalbo, Flame Gard, Inc. RECOMMENDATION: Delete the Exception. SUBSTANTIATION: This exception was gran ted with no technical documenta t ion to prove that the closer filter m o u n t i n g was safe and would not create a fire hazard. I have been told that no evidence was submit ted showing tha t this exception would create added problems. I mainta in that it is the duty of the exceptions submitter , no t its challengers, to prove that the change is safe and to do so in a m a n n e r that use ' s scientific processes and tests, no t field experience.

In section 4-1, GREASE REMOVAL DEVICES, NFPA calls for the use of "Listed" Grease Filters. The only agencies that mee t the require- ments of NFPA's definit ion for "Listed", (page 96-7, definitions) are Underwri ters Laboratories and ETL, both of whom test grease filters to UL's Standard 1046. Standard 1046 conducts its f lame exposure survivability test at a distance of 18 in., no t 6 in. This reason alone is e n o u g h to take out the exception. There are ways to get filters t e s t e d a n d approved for close proximity m o u n t i n g and those tests are available to all filter manufacturers . The delet ion of dais exception will no t stifle h o o d manufacturers , filter manufac ture rs or end users, it will only make t hem test their application to the specific purpose it is des igned for. We suggest that this except ion be deleted and that approval for close proximity filter moun t ing should be handled by the local authori ty having jurisdict ion on a case by case basis.

NOTE: "Supl~orting material is available for review at NFPA Headquarters . COMMITrEE ACTION: Reject. COMMITrEE STATEMENT: See commit tee r ecommenda t ions in Commit tee Proposals 96-52 (Log #102) and 96-54 (Log #103).

(Log # 103) 96 - 54- (4-2.1 Exception No. 2): Accept SUBMITTER: Technical Commit tee on Vent ing Systems for Cooking Appliances RECOMMENDATION: Add to the end of Exception No. 2 "when listed for this application." Revised Exception No. 2 will read as follows:

Exception No. 2: With cooking equ ipmen t without exposed f lame and where flue gases bypass grease removal devices, the m i n i m u m vertical distance may be reduced to no t less than 6 in. (152.4 m m ) when listed for this application. SUBSTANTIATION: Clarification of commit tee ' s intent. COMMITTEE ACTION: Accept.

(Log # 18) 96 - 55 - (4-2.2): Reject SUBMITTER: Ronald R Huffman, LDI Mfg. Co., Inc. RECOMMENDATION: Change last sentence of this paragraph to read as follows:

"The baffle shall no t be located less than 6 in. (154 mm) f rom tbe flue outlet" ra ther than " . . . 6 in. (154 m m ) f rom the grease removal d e v i c e s . " SUBSTANTIATION: It is recognized that the tempera ture of gases exiting the flues of gas cooking equ ipmen t may reach as higb as 1000 °. However, exper ience has shown that the tempera tures are reduced in avery short distance above the outlet as more temperate air en t ra ined both by natural convection and by flow created by the exhaust hood. Thus the t empera tures reaching a baffle 6 in. above the exhaust outlet will be modera te e n o u g h that a steel baffle located adjacent to the filters will no t create a problem. In addition, failure to assure a m i n i m u m distance between the baffle and the flue could result in baffles being placed so that the appl iance 's perfor- mance is affected. Baffles located adjacent to the filters themselves have proved to be very effective and have not created problems. COMMITrEE ACTION: Reject. COMMI'FrEE STATEMENT: Commit tee felt that submit ter ' s substantiat ion was no t adequate to justify the recommenda t ion .

(Log # 5) 96 - 56 - (4-2.3): Reject SUBMITTER: Phil Ackland, Commercia l Vent Cleaning Co. Ltd RECOMMENDATION: Revise text as follows:

4-2.3 Filters shall be made of steel. SUBSTANTIATION: The hood and duc t mus t be made of steel-why no t the filter? All these componen t s should require passing the s~Hne tes ts . COMMITI'EE ACTION: Reject. COMMITTEE STATEMENT: The commit tee was advised that UL plans to propose changes to the product s tandard on filters.

249

N F P A 9 6 ~ F 9 3 T C R

(Log # 6) 96 - 57- (4--2.3): Reject SUBMITTER: Phil Ackland, Commercia l Vent Cleaning Co. Ltd RECOMMENDATION: Revise text as follows:

4-2.3 Filter shall be uniformly 2 in. thick. SUBSTANTIATION: This will stop the use of thin filters with sharp clips to hold t hem inplace . COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: Commit tee felt that recommendation would unduly limit construct ion features of filters.

(Log # 76) 96 - 58 - (4-2.7 (New)): Accept in Principle SUBMITTER:Joseph N. Knapp, McDonald ' s Corp. RECOMMENDATION: Add a new section as follows:

"Where square filters are used, they a n d / o r the hood shall be keyed so the filters cannot be or iented in such a m a n n e r that they cannot drain grease as designed." SUBSTANTIATION: To prevent misinstallation of the filter(s) that would contradict the in tended design purpose, causing t hem to not be able to drain grease, or to retain more grease than designed. COMMITFEE ACTION: Accept in Principle.

Change "keyed" to "constructed" so that new subsection reads as follows:

4-2.7 Where square filters are used, they a n d / o r the hood shall be constructed so the filters cannot be or iented in such a m a n n e r that they cannot drain grease as designed. COMMITTEE STATEMENT: The word "keyed" is a design criteria and the commit tee felt that a pe r fo rmance r equ i r emen t was more appropriate.

( L o g # 104) 96- 59- (5-1.1, 5-1.2, 5-1.3, 5-1.4, 5-1.5(new)): Accept SUBMITTER: Technical Commit tee on Vent ing Systems for Cooking Appliances RECOMMENDATION: Revise 5-1.1 and 5-1.2 and add new 5-1.3, 5- 1.4, and 5-1.5 as follows:

5-1 Exhaust Fans for Commercia l Cooking Equipment .

5-1.1 Approved up d i tch , , gc ~ fans with motors su r rounded by the airstream shall be hinged, supplied with flexible weatherproof electrical cable and service hold-open retainers, and listed for this use. (Refer to FiLmre 5-1.1.) Installation shall conform to die requi rements of ~-8. C;.'ic,: cxh,~,~ f~,.~ fvi i.~,i~, u:,~. ol,all bY

. . . . . J r , , , * / t ~ ~ , , Q ~ / ~ , t . I I I

5-1.2 Inline exhaus t fans shall be of the type with the motor located outside the airs tream and belts and pulleys protected from the airstream by a grease-tight hous ing (Refer to Figure 5-1.2(a)). They shall be connected to the exhaust duct by flanges securely bolted as shown in Figures 5-1.2(b), (c), (d) or (e) or by a system specifically listed for such use. Hexible connectors shall not be used.

If the design or posit ioning of the fan allows grease to be trapped, a drain directed to a readily accessible and visible grease receptacle, no t exceeding 1 gallon, shall be provided. Inline exhaust fans shall be located in an easily accessible area of adequate size to allow for service or removal. If the duct system connected to the fan is in an enclosure, the space or room in which the exhaust fan is located shall have the same fire resistance rating as the enclosure.

5-1.3 Utility-set type exhaust fans (refer to Figure 5-1.3), if installed at the roo f top terminat ion point, shall mee t the requirements of 8.2.2, $-8.2.$, 3-8.2.4 and 3-8.2.8 (Refer to Figure A-1-$.2(c)). l f t he fan is installed within the building, it shall be located in an easily accessible area of adequate size to allow for service or removal. If the duct system connected to the fan is in an enclosure, the space or room in which the exhaust fan is located shall have the same fire resistance rating as the enclosure. They shall be connected to the exhaust duct by flanges securely bolted as shown in Figures 5-1.9(b), (c), (d) or (e) or by a system specifically listed for such use. Flexible connectors shall not be used. Exhanst fans shall have a drain directed to a readily accessible and visible grease receptacle not to exceed 1 gallon.

5-1.4 Exhaust fans housings shall be constructed of carbon steel no t less than 0.054 in. (1.$7 ram) (No. 16 MSG) or stainless steel not less than 0.045 in. (1.09 ram) (No. 18 MSG) in thickness or, if listed, constructed in accordance with the terms of file listing.

5-1.5 Openings for c leaning servicing and inspection shall confolxn to the requi rements of $-3.3. Clearances shall conform to the requirements of 1-3.2 or 3-7.1.3 if installed within an enclosure.

Existing 5-1.1 to be r enumbered to 5-1.6. Existing 5-1.2 to be deleted.

Add new Figures 5-1.1,5-1.2(a) -5-1.2(e), and 5-1.3.

This style o f fan is very popular due to its low cost and ease o f installation. It is very c o m m o n in one or two-story f ree-s tandingres taurants . The fan is made of spun a luminum. The motor and belt drive are outside the airstream.

F'zgure 5-1.1

250

N F P A 96 - - F 9 3 T C R

t

Figure 5-1.2(a)

INUN~

This fan would normally be used when space is not available for a utility set type. It would typically be located in a horizontal duct run in the false ceiling space.

F i . ~ IQ BE ~[TIONEO - ~ ~ iSDO'F RAIED 1,4" :ARBI]N STEEL ~I~ THAT ~ ~;KET IS \ /GASKET ~ STAINLESS STEEl. / PRgTECTEO FROM OlET \ / @firs M~X. 4" 0 C. / C l ~ t E t ,iTH V.~EASE \ / /

Lrtt IAgAER J UNASSEMBLED PEISITIDN ASSEMBLED POSIT!.CIN

~IG 5-I 2(b)

TYPICAL SECTION ON DUCT TO FAN qQNNECTION - BUTT JOINT METHOD

g

ISO0"F ~ATED ~ I14" CARBB4 STEEL

/ t ( U

LOZK WASHER

;IG

UNASSEMBLEO POS~.~ION ASSEMBLED POSITION

TYPICAL SECTION OF DUCT TO FAN CONNECTION - SEALANT METHOD

5-I 2(d)

P=-P-rMETE~ UjJ I! WELD ( TVp ) - u / / L~K i ~ ~ /

UN.ASSEMELEO POSIT ION

/ -L~S TO BE POSITII~.ED - ~ . i 15(~-~F RATED I/4" CA~BI]~ STEEL SD THAT THE GASKET S \ /GASKET n~ ~TAIMg~ . . . . . . P~-~OTECTED ~ DIRECT \ / ~"MI"~-'~-'~CFL~ CDNTAZT WITH 5RI-ASE \ / ......... "

/ ~I~ CLOW ¢' q

",%

/,

clG 5-i 2(c)

ASSEMBLED POSIT 1ON

TYPICAL SECTION OF DUCT TO FkN CONNECTION- OVERLAPPING ~IETHOD

}50(}'F ~ATED ~ \ i/4" CAREI}( STEEL --~ OASKET , OR STAI~,LESS STEEL

WELD STUDS l i I ' \ .~L~K WA~ER MAX 4 D c ~ r ~ I

FAN INLET --, [TTITTITIT[] ~ ~ ~ /~ MI N'[MUM ' "x '" x i18'

~ ; / /! ,' / /

/ /" ? i J'

I t \ "\ \ %,

~t "1 ]

FIG

UNASSEMBLE0 POS~- 10N ASSEMBLE0 POSITION

TYPICAL SECTION OF DUCT TO FAN CONNECTION

5-I 2(e) D|RECT TO FAN INLET CONE METHOD

251

NFPA 96- - F93 TCR

L r r m l ~ SET

This style of fan would generally be used for larger exhaust systems found in hotels, hospitals, prisons, etc., or restaurants located in high-rise buildings. It is typically mounted on the roof but is sometimes located in a mechanical room.

Figure 5-1.3

Also, add "exhaust fans" to 1-3.2 to read as follows: 1-3.2" Clearance. Hoods, grease extractors, exhaus t fans, and

ducts shall have a clearance of at least 18 in. (457.2 mm) to combustible material ... (text cont inues same as existing)

Revise 3-7.1.3 to include "or the exhaust fan" in the first line so that revised 3-7.1.3 reads as follows:

3-7.1.3 Clearance f rom the duct or the exhaust fan to the interior surface of enclosures of combustible construct ion shall be no t less than 18 in. (457.2 ram) ... (text cont inues same as existing) SUBSTANTIATION: The commit tee recognized for some time that NFPA 96 did not address inline fans or include specific installation requirements for inline or utility-set, type fans. A Task Group put together a repor t that was the basis for the Commit tee Proposal. COMMITTEE ACTION: Accept.

If the exhaust fan activates with the system this eliminates a majority of smoke damages to the building, and creates a cooling effect for the duc t r e d u c i n g h e a t transfer to combustible materials a round the hood. The h ighes t cost of damage to a building is no t caused by the actual f lame of the fire, bu t the by-products of fire, such as smoke damage, water damage.

I r e c o m m e n d this change to reduce the cost of insurance claims paid by the cus tomer anct in some instances the fire equ ipmen t company. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The commit tee considers it no t necessary for mandatory activation of the fan because the extinguish- ing systems are listed with fan operat ing and with fan no t operating.

(Log # 58) 96- 60- (5-2.1 Exception (New)): Accept SUBMITTER:Joseph N. Knapp, McDonald 's Corp. RECOMMENDATION: Add a new Exception as follows:

Exception: Transi t ion duct sections shall be permi t ted connected to the hood and to the exhaus t fan which do not mee t the above velocity, provided that they do not exceed 3 ft in length, and do not contain traps for grease. SUBSTANTIATION: Transit ions are a normal way of providing balanced exhaust and improved capture at the hoods, and of providing proper fit up to the exhaus t fan, while also providing reduced static loss and increased energy efficiency. The 3 ft length allowed at these points is no t adequate to create a serious grease bui ldup problem even in horizontal ducts. In vertical ducts there would be no grease buildup. C O M M I T r E E A C T I O N : Accept.

(Log # 13) 96 - 61 - (5-2.3): Reject SUBMITTER: D. Scott Nugent , Cagle's Fire Equ ipment & Welding Co. RECOMMENDATION: It is the r ecommenda t ion of myself and this company that this paragraph read that it is mandatory for the exhaust fan to activate with the system, unless fan shutdown is required by the hood manufacturer . SUBSTANTIATION: This letter is in reference to NFPA 96, Chapter 5, Section 5-2.3 "Air Movement". This particular paragraph says, the exhaust fans mus t cont inue to operate after ext inguishing system has been activated, bu t is no t necessary to restart t hem if cooking equ ipmen t has previously been shut down.

The wording of this paragraph is no t clear regarding the responsi- bility of the automatic fire system. Each of the major manufac turers list their systems t h rough Underwri ters Laboratories whether the exhaust fan is on or off. They also provide microswitches to provide automatic activation of the exhaust fan in case of a fire.

(Log # 107) 96 - 62 - (5-3 Exception (new)): Accept SUBMITTER: Technical Commit tee on Venting Systems for Cooking Appliances RECOMMENDATION: Add a new exception to 5-3 that reads as follows:

Exception:. . W h e n fire ext inguishing system discharges, make-u p air supphed internally to the hood shall be shu t off. SUBSTANTIATION: Shut t ing off make-up air supplied internally to the hood will avoid interference with fire suppression operation. COMMITTEE ACTION: Accept.

(Log # 59) 96 - 63 - (5~1 (New)): Accept SUBMITTER:Joseph N. Knapp, McDonald 's Corp. RECOMMENDATION: Add a new 5 4 as follows:

"Where master exhaust duct systems are installed which serve mult iple tenants, louvered outside air ducts shall br ing make up air into the system to maintain m i n i m u m duct velocity in the main duct. These ducts shall have the same material, clearance requirements , and fire suppression as the exhaust ducts. U n u s e d tenants branch ducts shall be d isconnected at the main duct, which shall be sealed at that point." SUBSTANTIATION: There is no clear provision to provide for m i n i m u m airflow in the main duct of manifold systems u n d e r varying t enan t occupancy, or to provide for proper fire suppression in branch ducts which are unused. The above is in tended to cover these omissions. COMMITTEE ACTION: Accept.

252

N F P A 96 1 F93 T C R

( L o g # 1) 96 - 64- (6-1): Reject SUBMITTER: P. Dana Bemis, Bemis & Sipala RECOMMENDATION: We would like to suggest tha t a motor ized two position dampe r be allowed at the roof fan suction. Many of these hoods serve only convection ovens, brazers, kettles, etc., or range tops all of which produce little or no grease. Perhaps exceptions could be made in these cases.

In the case of heavy frying or grease laden air, we would suggest a motorize guillotine dampe r at the fan roof curb open ing or in the situation of a v e n t set, a h inged dampe r on the fan discharge, motor ized to swing out o:[the air s t ream when open. SUBSTANTIATION: We under s t and that no dampers are permi t ted in the exhaus t duc t system. Our problem is, when school or church kitchen hoods, which have l imited use, are not funct ioning, the lack of a motor ized backdraft d a m p e r permits cold air back into the kitchen area. This is both a comfort and energy problem and concern. COMMITTEE ACTION: Reject. COMMITrEE STATEMENT: No specific proposal was submit ted and 6-1 covers such a device if it is listed.

(Log # 64) 96 - 65 - (6-1 Exception): Reject SUBMITTER: Arnold Bolahan, Mechanical Services RECOMMENDATION: ]Revise text as follows:

"Where specifically listed as part of a listed hood or o ther listed device or system." SUBSTANTIATION: This may be in terpre ted to mean that i ra ki tchen hood is const ructed to NFPA standards, you may be allowed to add a U.L. listed fire d a m p e r to the duct system. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: Commit tee considers existing text to be adequate.

(Log # 25) 96 - 66 - (6-2.4 Exception No. 1): Accept in Principle SUBMITTER: Philip Morton, NAFEM RECOMMENDATION: Change the exception to read as follows:

"Where part o f n listed g, co~¢ cx~ac~,,; h, ,vd, Exhaust Hoods With Exhaust Dampers or Exhanst Hoods Wi thout Exhaust Dampers." SUBSTANTIATION: The test s tandard for commercial exhaus t hoods is U.L. S tandard 710. U.L. issued a revised s tandard (fourth edition) on December 21, 1990. Concur ren t with the revised s tandard U.L. changed the titles and the n u m b e r of categories of hoods. Previous categories, "Grease Extractors" and "Automatic Damper and Hood Assemblies" have been combined into one category titled "Exhaust Hoods With Exhaust Dampers ." Previous category "Classified Hood" has been changed to "Exhaust Hood Wi thout Exhaust Damper." Revising this paragraph will make it consistent with the revised U.L. floes. COMMITTEE ACTION: Accept in Principle. COMMITTEE STATEMENT: See Recommenda t ion and Commit- tee Action on 96-67 (Log #38).

(Log # 38) 96 - 67 - (6-2.4 Exception No. 1): Accept SUBMITTER: James T. Otenbaker, Nat'l Assoc. of Ventilator Mfrs. RECOMMENDATION: Revise Exception No. 1 to read:

Exception No. 1 : Where part of a listed g, c,~c cxu-act~,, exhaust hood. SUBSTANTIATION: "Grease Extractor" as a listed device which was a UL produc t category is no longer available. In a recent change, based on the industry 's and others ' input, UL included tha t product with other exhaust hood categories. Also, please refer to ray Pdroposal on Section 1-2 "Definitions" for additional substantiat ion to

elete reference to "grease extractor." COMMITrEE ACTION: Accept.

(Log # 93) 96 - 68 - (6-3.1 (New)): Accept in Principle SUBMITTER: Phil Ackland, Commercia l Vent Cleaning Co. Ltd RECOMMENDATION: Add the following new material to 6-3.1 as follows:

6-3.1.? Any Equ ipmen t (listed or otherwise) which provides secondary filtration or air pollution control installed in the path of travel of exhaust products shall provide approved fire ext inguishing devices within the area of the filters. SUBSTANTIATION: This c o m m e n t is directed to the Air Pollution Control devices that are being pu t inline of the ducting. These systems contain filters which would no t be allowed separately in the hood but are g rouped together because the uni t is "Listed."

These filters m a y b e made of paper, cloth, light m e s h a l u m i n u m and even charcoal, all of which will become saturated with grease as part of their normal funct ion. I con tend tha t these materials, even without their being con tamina ted with grease are in fact f lammable. The fact that there is a fusible l inked d a m p e r is no t adequate protection.

A c o m m e n t regarding protection is stated in sorts at 7-1.2 but has been found to be most confusing as written and is D.9.L being imposed on these f lammable filter mediums. COMMITrEE ACTION: Accept in Principle.

Delete parenthes is and add text to the end of the sentence so tha t new 6-3.1 reads as follows:

6-3.1 Any equ ipmen t listed or otherwise that provides secondary filtration or air pollution control installed in the path of travel of exhanst products shall be provided with approved automat ic fire ext inguishing systems within the area of the filters and additional duc t protect ion downst ream of such equ ipmen t including any damper , if provided.

Revise 6-3 by delet ing "and shall no t increase the fire hazard" so that the first sentence ends .... "approved for such use." Revised 6-3 will read as follows:

6-3 Other Equipment . Fume incinerators, thermal recovery units, air pollution control devices, or o ther devices shall be permit ted to be installed in ducts or hoods or located in the path of travel of exhaust products when specifically approved for such use. Down- grading o the rpa r t s of the exhaus t system due to the installation of these approveddevices , whe ther listed or not, shall no t be allowed. COMMITTEE STATEMENT: The commit tee agreed with the submitter, expanded on the r ecommenda t i on to address the fire hazard downstream of such equipment , and revised 6-3 to reflect the new requi rements in 6-3.1.

(Log # 94) 96 - 69 - (6-3.1 (New)): Reject SUBMITTER: Phil Ackland, Commercia l Vent Cleaning Co. Ltd RECOMMENDATION: Add the following new material to Chapter 6 as follows:

6-3.1 Installation o f " O t h e r Equipment" 6-3 shall be installed by

~ ersons properly t ra ined and qualified to install the specific system eing provided. The installer shall certify to the Authori ty Having

Jurisdiction that the installation is in complete ag reemen t with the terms of the listing and the manufac tu re r s instructions a n d / o r approved design.

The installer is required toprovide the Authori ty Having Jurisdic- tion with a copy of the Initial Start-up Certificate, prior to an occupancy permit being issued.

NOTE: It is r e c o m m e n d e d tha t such training and qualification be by the manufac tu re r of the e q u i p m e n t being installed. SUBSTANTIATION: This proposal is taken f rom wording at 7-4.2 which relates to Fire Extinguishers. With the increasingly complex Hoods and Pollution Control devices available on the market today it is impor tan t that individuals who install t hem are accountable to see that they are installed properly. The onus of this responsibility should rest with the manufacturers .

Today's Pollution Control devices are in some cases, recondi t ioned air f rom the ki tchen exhaus t system back into

where unsuspect ing people are brea th ing itl It is essential that these systems be moni to red closely and regular ma in tenance is enforced for the safety of the occupants.

Refer to N.A.D.C.A~ documen t s on Indoor Air Quality, i.e, Sick Building Syndrome and Legionnaire ' s Disease. COMMITrEE ACTION: Reject. COMMITITEE STATEMENT: The commit tee believes that no single installer is responsible for the installation of "Other Equipment" identified in 6-3 and the concept is no t equivalent to ext inguishing equ ipmen t as in t imated by the submit ter ' s substantiation.

253

N F P A 9 6 ~ F 9 3 T C R

(Log # 26) 96 - 70 - (7-1): Accept SUBMITTER: Philip Morton, NAFEM RECOMMENDATION: Revise 7-1.1, revise the exception and reference it as Exception No. 1, add Exception No. 2, add a new paragraph 7-1.1.1 and revise pa ragraph 7-1.2, all as follows:

Revise7-1.1 as follows: 7-1.1 Approved fire ext inguishing equ ipmen t shall be provided for

the protect ion of grease removal devices, m ' ~ hoods s_.~X.tm.

Revise Exception No. 1 as follows: Exception No. 1: If acceptable to the authori ty having~urisdiction,

the port ion of the fire ext inguishing system c,,~c,,.d b~ Z~,c ~,,,,v;- ~; . . . . . f %1.I for the orotection of m-ease removal devices and hoods may be omit ted wher~ all cooldn~ e¢luipment is served by a Listed Gic,~c ExuactG.~ ~ c o n t a i n i n g a constant or fire- actuated water system and such water system is listed to ext inguish a fire in grease removal devices and hoods and does not adversely affect the operation of the fire ext inguishing system for the duct and cooking equipment .

Add a new Exception No. 2 as follows: Exception No. 2: If acceptable to the authori ty having jurisdiction,

the port ion of the fire ext inguishing system for the protection of the duct system may be omit ted when all the cooking equ ipmen t is served by a Listed Exhaust Hood with constant or fire-actuated water system and such water system is listed to ext inguish a fire in the duct system.

Add a new 7-1.1.1 as follows: 7-1.l.1 If a Listed Exhaust Hood with a constant or fire-actuated

water fire system is used, the water shall be permi t ted to be supplied f rom the kitchen cold or ho t water supply with all valves, if used, between the supply and the hood supervised. The system shall mee t the operat ing requi rements of 7-3.1.3.

Revise 7-1.2 as follows: %1.2 Duct ~pz . . . . . . . . d Cooking equ i pmen t (such as deep fat

fryers, ranges, griddles, and broilers) that may be a source of ignition of grease in the hood, grease removal device, or duc t shall be protected by an approved ext inguishing system. SUBSTANTIATION: The cur ren t wording does not allow the use of a fire-actuated water system for the protect ion of the duc t system. Several hood manufac tu re r s are in the process of testing and listing a water spray system, as part of a water-wash hood, for the protect ion of a duct system. Tests follow the same protocol as wet chemical systems.

The addition of paragraph 7-1.1.1 reflects a "yes" answer to a formal interpretat ion dated March 31, 1992. COMMITTEE ACTION: Accept.

(Log # 39) 96 - 71 - (7-1.1 Exception): Accept SUBMITTER;James T. Otenbaker , Nat'l Assoc. of Ventilator Mfrs. RECOMMENDATION: Revise Exception to read:

"Exception: f f accep tab l e . . , is served by listed g, c,,oc cx:~,ct t , o exhaust hoods conta in ing a c o n s t a n t . . , cooking equipment ." SUBSTANTIATION: Please refer to Substantiation in my proposal for paragraph 6-2.4, Exception No. 1. COMMITTEE ACTION: Accept.

(Log # 65) 96 - 72 - (7-3.1.3): Reject SUBMITTER: Marty Kelly, Brooks Equ ipment Co. RECOMMENDATION: Add new text as follows:

"When protected by a wet ext inguishing system, all electrical located unde r the ventilating e q u i p m e n t shall be shu t off." SUBSTANTIATION: This is to prevent electrical shockI COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: This issue is already adequately covered by NFPA 17A, Standard for Wet Chemical Ext inguishing Systems, and %2.2.1 in NFPA 96.

(Lo g # 111) 96 - 73 - (%3.1.4): Accept SUBMITTER: Technical Commit tee on Vent ing Systems for Cooking Appliances RECOMMENDATION: Delete the words "central station" from the first sentence of 7-3.1.4. Revised paragraph will read as follows:

7-3.1.4 The operation of any ext inguishing system applicable to this s tandard shall automatically signal any fire alarm signaling system serving the occupancy wherein the ext inguishing system is located, when such a larm system is present. Power to operate the ext inguishing system shall be moni to red by a supervisory alarm. SUBSTANTIATION: Commit tee recognized that central station is only one type of a larm service and made the 7-3.1.4 r equ i rement very l imited in application. COMMITTEE ACTION: Accept.

(Log # 95) 96 - 74 - (7-4.1): Accept in Principle SUBMITTER: Phil Ackland, Commercia l Vent Cleaning Co. Ltd RECOMMENDATION: Add the following new mater ia l to 7-4.1 as follows:

7-4,1 Where "Listed Hood Assemblies" 2-4 (Exhaust Hoods with Exhaust Dampers) or "Other Equipment" 6-3 are installed in a system a complete set of drawings and electrical schematics shall be available on the premises. SUBSTANTIATION: This will provide information to the Authority Having Jurisdiction and assist in future service work. COMMrVI'EE ACTION- Accept in Principle.

Add the following r equ i r emen t as a new 1-3.3 and r e n u m b e r existing 1-3.3 as 1-3.3.1; as follows:

1-3.3 A drawing(s) of the exhaust system installation along with a copy of operat ing instructions for subassemblies and componen ts used in the exhaust system, including electrical schematics, shall be available on the premises.

1-3.3.1 [same language as existing 1-3.3] COMMITTEE STATEMENT: Meets the in tent of the submitter.

(Log # 60) 96 - 75 - (7-5.1): Accept SUBMITTER:Joseph N. Knapp, McDonald ' s Corp. RECOMMENDATION: Add the following after the word "NOTE:" and prior to the existing verbiage; "Class B "gas" type portables, such as CO2 and ha lon shall no t be used in ki tchen cooking areas." SUBSTANTIATION: These types of portables cannot saponify, nor cool adequately to keep a fire in a deep fat fry vat f rom re-igniting. They provide a false sense of security that would not be unders tood by un t ra ined operators, and should no t be permit ted to be presented to them. COMMITTEE ACTION: Accept.

(Log # 27) 96- 76- (8-1.5): Accept in Principle SUBMITTER~ Philip Morton, NAFEM RECOMMENDATION: Revise 8-1.5 as.follows:

"Listed g , ~ c ~Aa,~tv,o Exhaust Hoods shall be operated in accordance with the terms of their listing and manufac tures instructions. SUBSTANTIATION: The test s tandard for commercial exhaus t hoods is U.L. Standard 710. U.L. issued a revised s tandard (fourth edition) on December 21, 1990. Concur ren t with the revised s tandard U.L. changed the titles and the n u m b e r of categories of hoods. Previous categories, "Grease Extractors" and "Automatic Damper and Hood Assemblies" have been combined into one category tided "Exhaust Hoods With Exhaust Dampers." Previous category "Classified Hood" has been changed to "Exhaust Hood Without Exhaust Damper." Revising dais paragraph will make it consistent with the revised U.L. tides. COMMITTEE ACTION: Accept in Principle. COMMITTEE STATEMENT: See Recommenda t ion and Commit- tee Action on 96-77 (Log #40).

254

N F P A 96 ~ F93 T C R

(Log # 40) 96 - 77 - (8-1.5): Accept SUBMITTER: James T. Otenbaker, Nat'l Assoc. of Ventilator Mfrs. RECOMMENDATION: Revise paragraph 8-1.5 to read:

"8-1.5 Listed gi ca~c ¢,,h ~,;~v,~ exhaust hoods shall b e . . . instruc- tions." SUBSTANTIATION: Please refer to Substantiation in my proposal for paragraph 6-2.4, Exception No. 1. COMMITI~E ACTION: Accept.

(Log # 96) 96 - 78 - (8-2.1 (New)): Accept in Principle SUBMITTER: Phil Ackland, Commercial Vent Cleaning Co. Ltd RECOMMENDATION: Add new material to 8-2.1.? as follows:

8-2.1.? An inspection and servicing of the "Listed Hood Assembly" (Exhaust Hoods with Exlaanst Dampers) (2-4) a n d / o r "Other Equipment" (6-3) by properly trained and qualified persons shall be made at least every six months. A certificate stating date of maintenance, work done and name,

address, and phone number of individual servicing the system shall be posted on the inside of the units control panel.

NOTE: It is r ecommended that such training and qualification be by the manufacturer of the equipment being installed. SUBSTANTIATION: This is duplicate wording of 8-2-1 (Fire Extinguishers). The same need for inspection is required with water washing type hoods and complex filtration systems, to insure they continue operating according to tile manufacturer 's specifications.

In the case of Listed Hood Assemblies (Dampered Hoods) one supposed function is to act to some degree as a fire extinguisher or at [east conta inment chamber.

In the case of Air Pollution Control Devices, these systems are filled with flammable filter medium and rely on precisely balanced air pressures to function properly. However. the most important reason for regular inspection is that more and more of these systems are being used to recirculate the "filtered" air off the cooking area back in to the building where unsuspecting occupants are breathing it.

In so far as these two items are quite different the committee might entertain the thought of two different numerical headings. Alternate Wordin~ Conversely, merg(ng these two categories into the existing text

could r e a d . . . "An inspection and set,Acing of the fire extinguisher system, listed

hood with exhaust damt, er a n d / o r secondarv filtration svstem (6-3~ by properly qualified persons shall be made at least every six months."

For the sake of brevity this could be equally effective. COMMITI'EE ACTION: Accept in Principle.

Revise 8-2.1 to read as tbllows: 8-2.1 An inspection and servicing of the fire extinguishing system

and listed exhaust hoods containing a constant or fire-actuated water system by properly qualified persons shall be made at least every six months.

Move existing note following 8-2.1 to appendix. COMMITrEESTATEMENT: Meets the intent of the submitter.

(Log # 77) 96 - 79 - (8-2.1.1): Accept in Principle SUBMITTER: Joseph N. Kna~p, McDonald's Corp. RECOMMENDATION: Add 'exhaust dampers" between the words "actuators" and "etc." in this section. SUBSTANTIATION: This section is often applied only to fire extinguishing systems. It should also be applied to the exhaust dampers which are also exposed to heat and grease buildup. COMMITrEE ACTION: Accept in Principle. Add "fire actuated dampers" between the words "actuators" and

"etc." and delete (see 7-2.2.2) from the last sentence so that revised 8-2.1.1 reads as follows:

8-2.1.1 All actuation components including remote manual pull stations, mechanical or electrical devices, detectors, actuators, fire actuated dampers, etc., shall be checked for proper operation during the inspection in accordance with the manufacturer 's listed procedures. In addition to these requirements, specific inspection requirements in the applicable NFPA standard shall also be followed. COMMITTEE STATEMENT: For clarification and meets file intent of the submitter.

(Log # 97) 96- 80- (8-2.1.1): Accept in Principle SUBMITTER: Phil Ackland, Commercial Vent Cleaning Co. Ltd RECOMMENDATION: Add the words "damper, timers, water wash controls and fixtures" to the first sentence of the text to read as follows:

"8-2.1.1 All actuation components including remote manual pull stations, mechanical or electrical devices, detectors, actuators, damners, timers, water wash controls and fixtures, etc., shall be checked f o r . . . " SUBSTANTIATION: This will serve to have water wash a n d / o r damper type hoods checked regularly. COMMITrEE ACTION: Accept in Principle. COMMITrEE STATEMENT: See Committee Action on 96-79 (Log #77).

(Log # 78) 96- 81 - (8-2.1.2): Accept in Principle SUBMITTER:Joseph N. Kna~p, McDonald's Corp. RECOMMENDATION: Add '( including fusible links on exhaust damper assemblies)" between tile words "Fusible links" and "and automatic sprinkler heads" in this section. SUBSTANTIATION: This section is often applied only to fire extinguishing systems. It should also be applied to the links on exhaust dampers which are also exposed to heat and grease. COMMITI'EE ACTION: Accept in Principle.

Revise parenthetical phrase to "fire actuated damper assemblies" so that revised 8-2.1.2 reads as follows:

8-2.1.2 Fusible links (including fusible links on fire actuated damper assemblies) and automatic sprinkler heads shall be replaced at least annually or more frequently if necessary to ensure proper operation of the system. Other detection devices shall be serviced or replaced in accordance with the manufacturer 's recommendations. COMMITTEE STATEMENT: Clarification and meets the intent of the submitter.

(Log# 11) 96 - 82 - (8-3.1): Reject SUBMITTERd Joseph Jacobs, Long Island Duct Cleaning Co., Inc. RECOMMENDATION: In the last sentence tile word "inspected" should be changed to "CLEANED".

It is imperative that to get Restauranteurs to abide with the spirit, as well as the letter of the code, 8-3.1 should be reworded to read:

"They shall be cleaned at least every six months" and eliminate tile ambiguity of what is meant between cleaned and inspected. SUBSTANTIATION: This paragraph presently states that "hoods, grease removal devices, fans, ducts, and other appurtenances shall be cleaned to bare metal at f requent intervals prior to surfaces becoming heavily contaminated with grease or oily sludge. They shall be inspected at least every six months." It would be interesting to learn what criteria is to be used to determine what period of time is considered frequent. The sentence "They shall be inspected at least every six months" has a far too liberal interpretation to insure ~, ublic safety as the word "inspected" does not translate to mean 'cleaned." In your Technical Committee Reports, 1990 Fall Meeting, item 96-

95 (8-3.1), Log #60 you seem to agree with the principle that inspections during operating hours are nearly impossible to perform thoroughly. But you neglect tile fact that any regularly used full time cooking establishment accumulates grease within the exhaust system that becomes a fire hazard regardless of the amount present.

Field experience has shown that Fire Marshals generally accept the premise that cleaning of grease exhaust systems at least every six months would not present a hardship to any full time cooking establishment but it would represent a minimally acceptable level of fire safety and public protection. COMMITTEE ACTION: Reject. COMMITI'EE STATEMENT: Recommendat ion does not take into consideration prescriptive versus performance. The committee has debated dais subject at great length on many occasions and realizes that the frequency of cleaning required varies with the amount and type of cooking; tile efficiency of filters, and many other factors.

255

N F P A 9 6 u F 9 3 T C R

(Log # 41) 96 - 83 - (8-3.1, NOTE): Accept SUBMITTER: James T. Otenbaker , Nat'l Assoc. of Ventilator Mfrs. RECOMMENDATION: Revise "NOTE" to read:

"NOTE: Depend ing o n . . . system, including exhaust hoods, should b e . . . Section 8-3." SUBSTANTIATION: Please refer to Substantiation in my proposal for paragraph 6-2.4, Exception No. 1. COMMITTEE ACTION: Accept.

(Log # 109) 96 - 84 - (8-3.1, NOTE): Accept SUBMITTER: Technical Commit tee on Venting Systems for Cooking Appliances RECOMMENDATION: Revise note following 8-3.1 by adding "and type" following "amount" and moving the entire note to Appendix A for informat ion purposes only. The Appendix i tem will read as follows:

A-8-3.1 Depend ing on the a m o u n t and type of cooking equ ipmen t usage the entire exhaus t system, including grease extractors, shou ld be inspected daily or weekly to de te rmine if grease or o ther residues have been deposi ted within. W h e n grease or o ther residues are in evidence as deposits within the hood, grease removal devices or ducts, or both, the system should be cleaned in accordance with Section 8-3.

Add an asterisk after 8-3.1 to indicate explanatory material in Appendix A. SUBSTANTIATION: Complies with NFPA's manua l of style. COMMITI'EE ACTION: Accept.

(Log # 98) 9 6 - 8 5 - (8-3.1): Reject SUBMITTER: Phil Ackland, Commercia l Vent Cleaning Co. Ltd RECOMMENDATION: Revise 8-3.1 to read as follows:

"All internal areas of the exhaust system shall be cleaned at intervals ~r ior to the surfaces becoming con tamina ted with grease residues.

Leave the existing "NOTE" as written. It talks abou t inspection. Add the following material to the d o c u m e n t after the present

NOTE: of 8-3.1 NOTE 2: The system will be best served where condit ions spelled

out in 3-1.5, 3-3(a11), 3-5.2.1, 5-1, and 3-8.2.8 are conformed with. Systems that do no t conform to these sections may require

upgrading. SUBSTANTIATION: Drop the list of the ~,arts in the first sentence; phrases such as "heavily" and "oily s ludge , ' are too vague and open to interpretation.

I believe in the expression "Bare Metal" as the spirit of what the commit tee wishes to say but the reality is that there can rarely be a situation where 100 percent of the entire system is cleaned to "bare metal." The expression is still too open to interpretat ion.

Additionally, the parties charged to clean the system are no t responsible for the design or installation. The vast n u m b e r of systems contain inaccessible areas or are not built in a m a n n e r that facilitate their being cleaned with adequate amoun t s of water; it is irrational to make the vent cleaner responsible for the poor construction of the systems.

As the Codes improve greater n u m b e r s of systems will be capable of being serviced more thoroughly, but the wording of the present Code dictates that all svstems re~,ardless of their construct ion deficiencies mus t be clean to pe'rfection is unreasonable .

~ e c t every six months ," as it is too vague, and the party charged with this inspect ion is no t clearly defined.

The vast n u m b e r of Fire Officials 1 bare spoken with relate tha t they simply look for the "tag" or "Certificate Of Performance" of a vent cleaner, m u c h like that required on the fire extinguishers, to de te rmine the service needs of the exhaus t system.

It is equally unrealistic to expect a fire official to reques t an operat ing system be shut down in order to inspect i t Very few people are foolish enough to reach across ho t operat ing cooking e q m p m e n t to remove hot greasy filters.

Some s ta tement needs to be made that systems mus t conform to this s tandard if they are expected to be cleaned. Large n u m b e r s of systems were never installed properly to facilitate cleaning through- out.

NOTE 2 will assist restaurants, Authori t ies Having Jurisdiction and vent cleaners who are trying to live up to NFPA 96 to install access and make fans tip, both of which are required to access all areas that require cleaning.

COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The commit tee felt that progress in cleaning requi rements made dur ing the last revision of NFPA 96 would be u n d o n e if this r ecommenda t ion was to be adopted.

(Log # 99) 96- 86- (8-3.1 (New)): Accept in Principle SUBMITTER: Phil Ackland, Commercia l Vent Cleaning Co. Ltd RECOMMENDATION: Add the following new text to 8-3.1 to read as follows:

8-3.1.? When the system is used on a regular daily basis, the system will require cleaning on the following schedule.

Systems utilizing solid cooking fuels or 24 hr h igh volume frying, char broiling or Oriental cooking; monthly.

Systems utilizing high volumes of fast food frying, charbroil ing or Oriental cooking; quarterly.

Systems utilizing normal volumes of commercial cooking or baking: semi annually.

Systems utilizing low vapor producing cooking (pizza ovens, s team tables) z annually.

NOTE: Intervals between inspections and cleaning specified above will vary depend ing on types and volumes of use, condit ions of equ ipmen t and efficiency of hood filtration. The Authori ty Having Jurisdiction mus t adjust the frequencies of cleaning required if condit ions so warrant.

In Appendix, state: "Systems which are only used on a part t ime or seasonal basis

could require a reduced frequency." SUBSTANTIATION: This schedule provides for the Authority Having Jurisdiction a guide to requir ing service to the systems.

The Authori ty Having Jurisdiction is looking for direction from this Code. The above text provides both a guide and flexibility to assist t hem in do ing their job. COMMITTEE ACTION: Accept in Principle.

Move dais section to Appendix A, revise "will" to "should", and add "inspected, and cleaned if necessary," so that new appendix i tem reads as follows:

A-8-3.1 W h e n the system is used on a regular daily basis, the system should be inspected, and cleaned if necessary, on the following schedule.

Systems utilizing solid cooking fuels or 24 hr h igh volume frying, char broiling or Oriental cooking; monthly.

Systems utilizing h igh volumes of fast food frying, charbroil ing or Oriental cooking; quarterly.

Systems utilizing normal volumes of commercial cooking or baking; semi annually.

Systems utilizing low vapor producing cooking (pizza ovens, s team tables) ; annually.

NOTE: Intervals between inspections and cleaning specified above will vary depend ing on types and volumes of use, condit ions of equ ipmen t and efficiency of hood filtration. The Authori ty Having Jurisdiction may adjust the frequencies of cleaning required if condit ions so warrant. Systems which are only used on a part t ime or seasonal basis could require a reduced frequency. COMMITTEE STATEMENT: Commit tee agreed with the intent of the submitter, bu t felt that the information be longed in the appendix for informational purposes and no t in the text as a requirement .

(Log # 84) 96 - 87 - (8-3.1, A-8-3.1 (New)): Accept in Principle SUBMITTER: J o h n IL Bouchard, SedgwickJames of N.E. RECOMMENDATION: Add an asterisk following 8-3.1 to indicate explanatory material on that paragraph in Appendix A.

Add a new A-8-3.1 to Appendix as follows: A-8-3.1 The 1971 and earlier editions of NFPA96 contained an appendix with a suggested me thod of cleaning duct systems. The appendix r e c o m m e n d e d the use of a powder c o m p o u n d with saponifying [to convert (as fat) into soap] qualities to facilitate cleaning a duc t system heavily contamina ted with soft grease or oily sludge. "This c o m p o u n d saponifies the wet grease or oily sludge, thus making it m u c h easier to clean with hand scrapers."

The appendix information was reduced to a brief note in the 1973 edition of NFPA 96. The Commit tee t hen realized that the c o m p o u n d that was r e c o m m e n d e d to facilitate the cleaning process was being miscons t rued as having fire re tardant propert ies and all reference to the powder c o m p o u n d was deleted from the 1976 and all subsequen t editions.

256

N F P A 96 - - F93 T C R

Powder compounds and other substances have cont inued being used, sometimes not as a me thod to facilitate cleaning, but as a substitute for cleaning to bare metal.

It is the intent of the Cornmittee that when a duct is cleaned to bare metal that it no t be coated with a powder or other substance. SUBSTANTIATION: The use of powder compounds has cont inued to be misused and abused. The new text in Appendix A will give some direction to the enforcing authority. COMMITTEE ACTION: Accept in Principle. Add a new second sentence in 8-3.1 and make the existing second

sentence the third sentence, to read as follows: 8-3.1 Hoods, grease removal devices, fans, ducts, and other

appurtenances shall be cleaned to bare metal at f requent intervals prior to surfaces becoming heavily contaminated with grease or oily sludge. After cleaning to bare metal, the exhaust system shall not be coated with powder or other substance. They shall be inspected at least every six months.

Do not add appendix note. COMMITrEE STATEMENT: Committee agreed with submitter, but felt that stating the requirement in the body of the standard would better reflect the intent of the committee.

SUBSTANTIATION: This information provides guidance in both safety and procedu re. COMMITYEE ACTION: Reject. COMMITI'EE STATEMENT: Committee believes this recommen- dation is outside the scope of the standard.

(Log # 100) 96 - 90 - (8-3.5): Accept SUBMITTER: Phil Ackland, Commercial Vent Cleaning Co. Ltd RECOMMENDATION: Replace existing text and reword as follows:

"If required after the cleaning process, the fire extinguisher system shall be re turned to an operable state by qualified personnel in accordance to 7-4.2."

Separate the last sentence to r e ad . . . 8-3.5.? All access panels (doors), cover plates shall be replaced.

Dampers and diffusers shall be positioned for proper airflow. SUBSTANTIATION: None. COMMITrEE ACTION: Accept.

Make all sentences in the recommendat ion part of 8-3.5.

(Log # 7) 96 - 88 - (8-3.1, A-8.3.1 (New)): Accept in Principle SUBMITTER: Phil Acklmad, Commercial Vent Cleaning Co. Ltd RECOMMENDATION: In the interest of gaining acceptance of proposal log numbers 31, 60, 61 and 63, it has been suggested that we move the entire frequency issue to the Appendix of the Code.

First, Add an asterisk after 8-3.1 to indicate that explanatory material on

tha tparagraph is in Appendix A. A d d i n the appendix new A-8-3.1 as follows: "The required frequency of cleaning of hoods, grease removal

devices, duct, fans, and other appurtenances will vary depending on the type and frequency o!t" cooking, efficiency of the exhaust system, and other variables.

The minimum recommended cleaning frequency for systems serving 24-hr operations ,DR those doing solid fuel cooking is every month. The minimum recommended cleaning for systems serving high

volumes of fast food, frying, char-broiling, or Oriental cooking is every three months. The minimum recommended cleaningfrequency for systems

serving normal commercial cooking orbaking conditions is every six months.

NOTE: These suggested minimum frequencies are meant to serve as a guide only. Local conditions and situations do vary and minimum frequencies should be established accordingly so as to avoid compromising the safety of the premises." SUBSTANTIATION: My purpose is to provide a guide while not creating a demand. The local Authority HavingJurisdictio.n should be the one to decide proper frecluency. The proposal is to put the data in the appendix where it is reformation only to assist in that decision.

The foregoing suggestions should provide the "Authority Having Jurisdiction" with some easily definable reference points on which to base h i s /he r decisions.

This information will establish the realization that regularly scheduled maintenance is necessary to remove the dangerous grease accumulation from the accessible components of the system. We need to make it clear that all systems, even those containing so-called serf-washing hoods, are subject to grease accumulation over time and that the accumulation must be removed by visible inspection and cleaning. The aim is to provide guidelines for the minimum frequency of such cleanings,which may vary according to the type of system or cooking done. COMMITTEE ACTION: Accept in Principle. COMMITTEE STATEMENT: See Committee Action on 96-86 (Log #99).

(Log# 101) 96 - 89 - (8-3.2 (New)): Reject SUBMITTER: Phil Ackiand, Commercial Vent Cleaning Co. Ltd RECOMMENDATION: Add new material to 8-3.2.? as follows:

8-3.2.? Areas and equipment beneath the exhaust systems shall be covered and properly protected during the cleaning process.

8-3.2.? Waste water from the cleaning process shall be disposed of into the grease trap on premises or at an approved dump site.

(Log # 17) 96 - 91 - (10-1 (New)): Reject SUBMITTER: Harold Schoendorf, FL Assoc. of Plumbing, Gas & Mechanical Inspectors, Inc. RECOMMENDATION: Add new text as follows:

Referenced Publications SMACNA Publication - Sheet Metal and Air Conditioning Contrac-

tors' National Assn., Inc., 8224 Old Courthouse Rd., Tysons Corner, Vienna, VA 22180

Rectangular Industrial Duct Construction Standards. Round Industrial Duct Construction Standards.

SUBSTANTIATION: NFPA 96 does not reference duct construction standards. COMMIq['rEE ACTION: Reject. COMMITrEE STATEMENT: Committee felt that the referenced SMACNA publications were not appropriate for grease duct constrncti on.

(Log # 42) 96 - 92 - (10-1.3): Accept in Principle sLrBMITTEI~ James T. Otenbaker, Nat'l Assoc. of Ventilator Mfrs. RECOMMENDATION: Include the following two additional UL Standard in this paragraph.

UL 710, Exhaust Hoods for Commercial Cooking Equipment. UI 1046, Grease Filters for Exhaust Ducts.

SUBSTANTIATION: These Standards have been included in my

~ roposals for paragraphs 2-1.1, Exception; 2-1.2, Exception; 2-1.2, xception No. 1; 3-5.2.1, Exception No. 2, and Section 4-1. Hence,

they should be included in the Referenced Publications. COMMITrEEACTION: Accept in Principle.

Move the UL publications to a new appendix chapter on Refer- enced Publications. COMMITrEE STATEMENT: The UL standards are not referenced within the standard and should not be included in Chapter 10.

(Log # 113) 96 - 93 - (Chapter 11 (new)): Accept SUBMITTER: Technical Committee on Venting Systems for Cooking Appliances RECOMMENDATION: Add a new definition in Section 1-2 for Solid Fuel Cooking Equipment, as follows:

1-2 Definitions. Solid Fuel Cooking Equipment. Cooking equipment that is fired

with "solid cooking fuel." This includes ovens, tanduri charcoal pots, grills, broilers, rotisseries, barbecue pits, or any other type of cooking equipment that derives all or part of its heat source from the burning of "solid cooking fuel." Add a new Chapter 11 addressing solid fuel cooking operations, as

follows:

257

N F P A 96 1 F93 T C R

Chapter 11 Solid Fuel Cooking Operations 11-1 Venting Requirements ofsolid fuel cooking operations shall

be determined as follows: 11-1.1 When the solid fuel cooking equipment is required by the

manufacturer to have a natural draft, the vent shall comply with 11-3 of this chapter.

11-1.2 When the solid fuel cooking equipment has a self-contained top and is the only appliance to be vented in an isolated space (except for a single water heater with its own separate vent) and has a separate make-up air system, and with supply and return air (not supplying or returning from other spaces), then the system shall comply with 11-3 and 11-5 of this chapter.

11-1.3 When the solid fuel cooking equipment is located in a space with other vented equipment, then all vented equipment shall have an exhaust system interlocked with a make-up air system for the space as per 11-5 of this chapter.

11-1.4 When it is claimed by the manufacturer that an appliance must operate with a natural draft vent, but this standard requires that it be power exhausted, then the vent shall comply with 11-2, 11- 3, and 11-5 of this chapter.

11-1.5 Wben a solid fuel cooking appliance could permit effluent to escape from the appliance opening, then this opening shall be covered by a hood and an exhaust system that meets the require- ments of 11-2, 11-3, and 11-5 of this chapter.

11-1.6 Solid fuel cooking operations shall have spark arresters prior to any filtration device in a hood, and at the termination of a chimney without a hood.

11-2 Hoods for Solid Fuel Cooking. ffa hood is required over the entire appliance or only over the front opening of the appliance, then the hood shall be so sized and located as to be able to capture and contain all of the effluent coming from the appliances. The hood and its exhaust system shall comply with Chapters 2 through 7 of this standard.

11-2.1 Hoods serving solid fuel cooking appliances shall be separate from other hoods and duct systems unless a separation is made to assure that airborne sparks and embers are isolated from the duct system and deep fat fryers, if existing.

11-3 Exhaust Systems for Solid Fuel Cooking. When a hood is not required and only a chimney from the appliance flue collar is used, the chimney must comply with NFPA 211 and shall have a cleanable liner.

11-3.1 ffa hood is used the duct system shall also comply with Chapter 3 of this standard.

11-3.2 Wall terminations of solid fuel exhaust systems shall be prohibited.

11-4 Grease Removal Devices for Solid Fuel Cooking. Grease removal devices, other than listed grease filters or listed hood assemblies, shall be approved for solid fuel cooking and comply with Chapter 4 of tlais standard.

11-4.1 If airborne sparks and embers can be generated by the solid fuel cooking operation, spark arrester devices must be used prior to the grease removal device, to minimize the entrance of these sparks and embers into the grease removal device and on to the filter plenum and duct system.

11-4.2 Listed filters shall be a minimum of 4' above the appliance. 11-5 Air Movement for Solid Fuel Cooking.

Exhaust and capture requirements shall be as per Chapter 5 for hooded operation and as per manufacturer's recommendation for unboodedapplications.

11-5.1 A replacement or make-up air system shall be provided to assure a positive supply of replacement air at all times during cooking operation.

11-5.2 Make-up air systems serving solid fuel cooking operations shall be interlocked with the exhaust air system and powered if necessary to prevent the space from attaining a negative pressure the entire time the solid fuel appliance is heated.

11-5.3 The make-up air system shall be filtered and shall not adversely reduce the comfort condition of the occupied space.

11-6 Auxiliary Equipment for Solid Fuel Cooking. Auxiliary equipment for solid fuel cooking shall be as per Chapter 6 of this standard and as follows.

11-6.1 For solid fuel appliances that are not under hood and are operating with a natural draft, there shall be minimally a combina- tion type detector(s) installed above and in front of the cooking and service openings of the appliance, such that it would detect heavy smoke or fire emanating from these. Such detector(s) and their application shall comply with NFPA-72E, and be acceptable to the authority having jurisdiction. Unusual hazards that can require additional detection or signaling shall be so judged by the authority having jurisdiction.

11-6.2 When a solid fuel burning appliance is only natural draft, and not served by a system complying with Chapter 7 of this standard, it shall be fitted with a fire detection device at the junction of the flue and chimney that is listed or approved for the purpose

and use environment, and which will also shut down the auxiliary fuel, if existing, in the event it detects a fire at the junction.

11-7 Fire Extinguishing Equipment for Solid Fuel Cooking. 11-7.1 Approved fire extinguishing equipment shall be provided to

protect all solid fuel burning cooking appliances that may be a source of ignition of grease in the hood, grease removal device, or duct.

Exception: If acceptable to the authority having jurisdiction, solid fuel burning cooking appliances constructed of solid masonry or reinforced portland or refractory cement concrete and vented in accordance with NFPA 211, Chapters 3 and 4, may not require fixed pipe fire extinguishing equipment.

11-7.2 The fire extinguishing equipment, when required, shall comply with Chapter 7, Fire Extinguishing Equipment.

Exception: Fixed fire extinguishing equipment and/or portable fire extinguisher containing sodium bicarbonate or potassium bicarbonate dry chemical shall not be permitted to be used for protection of solid fuel burning cooking appliances.

11-7.3 The fire extinguishing equipment shall be rated and designed to extinguish solid fuel cooking fires, in accordance with the manufacturer s recommendations. The fire extinguishing equipment shall be of sufficient size to totally extinguish fire in the entire hazard area and prohibit re-ignition of the grease for a minimum of five minutes, as per U.L. Subject 300, 4.2.

11-7.4 All solid fuel appliances (whether under a hood or not) with fire boxes of 3 sq. ft. volume or less shall minimally have a portable water source in the immediate vicinity of the appliance. This container shall be kept full and fully operationalat all times. Whenever it is used during ash removal, it must be filled again immediately.

11-7.5 Solid fuel appliances with fire boxes exceeding 5 cu. ft. shall be provided with a fLxed pipe system with a hose in the immediate vicinity of the appliance. This system shall have a minimum operating pressure of 40 psi, and shall provide a minimum of 5 GPH per cu. ft. of fire box volume.

11-7.6 Fire suppression for fuel storage areas shall comply with 11-9 of this chapter.

11-7.7 When any solid fuel cooking appliance is also provided with auxiliary electric, gas, oil, or other fuel for ignition or supplemental heat, and it is also served by anyportion of a fire extinguishing system complying with Chapter 7o f this standard, such auxiliary fuel shall be shut off upon actuation of said fire extinguishing system.

11-8 Procedures For Inspection, Cleaning, andMaintenance for Solid Fuel Cooking.

11-8.1. Solid. fuel. cooking appliances, shall be inspected., cleaned. , and maintained m accordance with the procedures as gqven m Chapter 8 of this standard, and with the following.

11-8.1.1 The combustion chamber shall be scraped clean to its original surface once each week and inspected for deterioration or defects. Any significant deterioration or defect that might weaken the chamber or reduce its insulation capability must be immediately repaired.

11-8.1.2 The flue or chimney shall be inspected weekly (a) for residue that might begin to restrict the vent or create an additional fuel source, andcleaned before these conditions exist; and (b) for corrosion or physical damage that might reduce the flue's capability of containing the effluent, and repaired or replaced should any unsafe condition be evident.

11-8.1.3 Spark arrester screens located at the entrance of the flue or in the hood assembly must be cleaned daily or as soon as contaminated.

11-8.1.4 Filter or filtration devices installed in a hood must be cleaned daily or as often as visually contaminated.

11-9 Minimum Safety Requirements, Fuel Storage, Handling, and Ash Removal for Solid Fuel Cooking.

11-9.1 Installation clearances. 11-9.1.1 Solid fuel cooking appliances shall be installed on floors of

non-combustible construction that extend 3' from any opening or service door.

Exception 1: Floors with non-combustible surfaces that have been approved for such use by the local authority.

Exception 2: Floor assemblies that have been listed for such application. Exception 3: Solid fuel cooking appliances that have been listed

for zero clearance to combustibles on the bottom and sides. 11-9.1.2 Combustible and limited combustible surfaces or

construction within 3' of the sides and 6' above a solid fuel cooking appliance shall be protected in a manner acceptable to the authority having jurisdiction.

Exception 1: Construction that has been listed or approved for lesser clearance.

Exception 2: Solid fuel cooking appliances that are specifically listed for lesser clearances to combustibles.

258

N F P A 96 - - F 9 3 T C R

11-9.2 Solid Fuel Storage... 11-9.2.1 Fuel storage in the same room as the solid fuel appliance,

or in the same room with itts fuel loading or clean-out doors, shall not exceed one day's requirement.

11-9.2.2 Fuel shall n o t b e stored above any heated appliance, unit, or vent, nor closer than 3' to any port ion of a solid fuel appliance constructed of metal, or may other cooking appliance that could ignite the fuel.

Exception: A solid fuel appliance, or other cooking appliance that is listed or approved for lesser clearance to combustibles.

11-9.2.3 Fuel shall not be stored closer than 6' within the line of sight of any fuel loading opening or clean-out door of the solid fuel appliance, and not in the path of the ash removal.

11-9.2.4 Fuel shall only be stored in an area with walls, foor , and ceiling of non-combustible construction, extending at least 3' past the outside dimensions of the storage pile.

Exception: Combustible or limited combustible materials protected in accordance with 1-3.2, Exceptions 2, 3, or 4.

11-9.2.5 Fuel shall be separated from all flammable liquids, all ignition sources, chemica![s, and from food supplies and packaging goods.

11-9.2.6 All fuel storage areas shall be provided with a sprinkler system meeting the requirements of NFPA-13 and acceptable to the authority having jurisdiction, or with a fixed pipe system with a hose in the immediate vicinity of the storage area, and able to reach to all parts of the area. This fixed pipe system shall meet the requirements of 11-7 through 11-7.7 of'this chapter.

Exception: The portable container indicated in 11-7.4 may be used for a solid fuel pile, provided that the fuel pile does not exceed 5 cu. ft.

11-9.3 Solid Fuel Handling and Ash Removal. 11-9.3.1 Solid fuel shall be ignited with a match or an approved

built-in gas flame or other approved ignition source. Combustible fluids shall not be used to assist ignition. Matches and other portable ignition sources shall not be stored in the immediate vicinity of the solid fuel appliance where they might ignite by radiant heat or spark.

11-9.3.2 Solid fuel shall be added to the fire as required in a safe manner , and in quantities and ways not creating a higher flame than is required. Long handled tongs, hooks, and other required devices shall be provided and used in order to safely add fuel, adjust the fuel

~ osition, and control the fire, without having to reach into the fire OX,

11-9.3.3 Ash (and cinders, and other fire debris) shall be removed from the fire box at adequately r%,ular intervals to not interfere with the draft to the fire, and ,Lo minimtze the length of time the access door is opened. All ash must be removed from the chamber a minimum of once a day.

11-9.3.4 The ash shall be sprinkled adequately before removal to put out any hot ash or cinders, and to control the dust when the ash is moved. For this purpose, and to cool down a fire that has become too hot and to stop all fire before leaving the premises, a water supply with flexible hose must be provided at the solid fuel appliance. For appliances with fire boxes of less than 5 cu. ft., the water source may be a ten gallon container with pumped pressure or gravity drain. For applimlces with fire boxes over 5 cu. ft., the water source must be a fixed pipe system with a hose of adequate length to reach to the combustion and cooking chambers of the appliance. For either application, the nozzle shall be fitted with a manual shut- off device, and shall be of the type to provide a fine to medium spray of adequate length to reach all areas of the combustion and cooking chambers. A full flow or strong stream shall not be used.

11-9.3.5 Heavy metal containers or carts (minimum 16 gauge) with covers shall be provided for the removal of the ash. These shall not exceed a maximum of 20 gallon capacity, shall be assigned for dais one purpose, shall be able to be handled easily byany employee assigned the task, and shall pass easily through any passageway to the outside. The container or cart shall always be covered when it is being moved through the premises. When any hole occurs in a container or cart f rom corrosion or damage, it shall be immediately repaired or the container or cart replaced.

11-9.3.6 Adequate long-handled rakes, hoes, scrapers, shovels, and such tools shall be provided for the removal of ash so that ash removal can be accomplished without having to reach into the chamber. The ash shall be spread out gently in small lots on the chamber floor, or on a shovel to be sprayed before it is removed to the metal container or cart. If the floor of the chamber is of a metal that is subject to rapid corrosion from the water, then a non- combust ible/non-corrodible pan shall be placed just outside the clean-out door for this purpose.

11-9.3.7 The ash shall be carried to a separate heavy metal container. (or dumpster) used exclusively for this. purpose. This continuer shall be separated from all combusuble construction and materials. The container shall be covered.

11-9.4 Other Safety Requirements. 11-9.4.1 Metal fabricated solid fuel cooking appliances shall be

listed for the application when produced in practical quantities, or shall be approved by the authority having jurisdiction. When listed, they shall be installed in accordance with the terms of their listing and with the additional requirements of this standard.

11-9.4.2 All other solid fuel cookin!g appliances shall be submitted for approval to the authority having jurisdiction before being considered for installation. All units submitted to the authority having jurisdiction shall be installed, operated, and maintained in accordance with the terms of the manufacturer 's instructions and any additional requirements set forth by the authority having jurisdiction.

11-9.4.3 Except for the spark arrester required in 11-1.6, there shall be no additional devices of any type in any portion of the appliance, flue pipe, and chimney of a natural draft solid fuel operation.

11-9.4.4 No solid fuel cooking device of any type shall be permitted for deep fat frying involving more than one quart of liquid shorten- ing, nor shall any solid fuel cooking device be permit ted within 3' of any other deep fat frying unit.

Add the following new sections: 2-5 Solid Fuel Hood Assemblies.

When solid fuel cooking equipment is to be used, the solid fuel hood assembly shall comply with Chapter 11 of this standard.

3-9 Solid Fuel Duct Systems. When solid fuel cooking equipment is to be vented, the duct system shall comply with Chapter 11 of this standard.

4-3 SolidFuel Grease Removal Devices. When solid fuel cooking is served with grease-removal devices, these devices shall comply with Chapter 11 of this standard.

5-4 Solid Fuel Air Movement Requirements. When solid fuel cooking equipment is used, exhaust and replace- ment air must also comply with Chapter 11 of this standard.

6-4 Solid Fuel Auxiliary Equipment. When solid fuel cooking comprises any part of a cooking operation, additional provisions and equipment as described in Chapter 11 of this standard shall be used when required.

7-6 Solid Fuel Fire Extinguishing Equipment. When solid fuel cooking equipment is served by fire extinguishing equipment, additional provisions of Chapter 11 of this standard shall be considered.

8-4 Operation, Maintenance, and Inspection of Solid Fuel Cooking Uipment. en solid fuel cooking equipment is used, the special provisions of

Chapter 11 of this standard shall be considered. A-l-1 When solid fuel is burned in cooking operations, increased

quantities of carbon, creosote and grease-laden vapors are produced which rapidly contaminate surfaces, produce airborne sparks and embers, and are subject to significant flare-ups. Also, solid fuel cooking requires fuel storage and handling, and produces ash that requires disposal. For these reasons solid fuel cooking operations should comply with Chapter 11 of this standard. SUBSTANTIATION: The committee addressed solid fuel cooking equipment in the 1991 edition of NFPA 96, but realized that an in- depth study of solid fuel cooking equipment was necessary. A Task Group was named and has visited locations where solid fuel cooking was in operation and reported their findings to the Technical Committee. The report of the Task Group was the basis for the Technical Committee proposal on this new chapter. COMMIT'tEE ACTION: Accept.

(Log# 12) 96 - 94 - (Chapter 11 (TIA91-1)): Accept in Principle SUBMITTER: Technical Committee on Venting Systems for Cooking Appliances RECOMMENDATION: Pursuant to Section 15 of the NFPA Regulations Governing Committee Projects, the National Fire Protection Association has issued the following Tentative Interim Amendmen t to NFPA 96, Standard for the Installation of Equipment for the Removal of Smoke and Grease-Laden Vapors from Commer- cial Cooking Equipment, 1991 edition. The TIA was processed by the Venting Systems for Cooking Appliances Committee and was issued by the Standards Council on October 4, 1991, and will become effective on October 24, 1991. A Tentative Interim A m e n d m e n t is tentative because it has not

been processed through the entire standards-making procedures. It is interim because it is effective only between editions of the standard. A TIA automatically becomes a proposal of the p roponen t for the next edition of the standard; as such, it then is subject to all of the procedures of the standards making process.

259

N F P A 9 6 1 F 9 3 T C R

1. Add definit ion to Section 1-2 as follows: "Recirculating Systems. Systems for control of smoke or grease-

laden vapors f rom commercial cooking equ i pmen t that do not exhaust to the outside."

2. Add new Chapter as follows: Chapter 11 Recirculating Systems

11-1 Recirculating systems containing or for use with appliances used in processes produc ing smoke or grease-laden vapors shall be equipped with componen t s complying with the following:

(a) The clearance requi rements of 1-3.2, (b) A hood complying with the requ i rements of Chapter 2, (c) Grease removal devices complying with Chapter 4, (d) The air movemen t requi rements of Chapter 5, Exception: 5-2.1

and 5-2.3. (e) Auxiliary equ i pmen t (such as particulate and odor removal

devices) complying with Chapter 6, (f) Fire ext inguishing e q u i p m e n t complying with the requi rements

of Chapter 7, Exception: references to ducts. The use and ma in tenance requ i rements of Chapter 8,

I ~ The m i n i m u m safety requi rements of Chapter 9, (i) All the special requi rements of Chapter 11. 11-2 Design Restrictions. All recirculating systems shall comply

with the following: 11-2.1 Only gas or electric fueled cooking appliances shall be

incorporated. Gas fueled appliances shall no t have the combust ion flue outlet(s) directly connec ted to the recirculating system. Gas fueled appliances shall have a m i n i m u m 18 in. (457.2 ram) clearance f rom the flue outlet to the filter inlet in accordance with subsection 4-2.2 and shall mee t the installation requ i rements of NFPA 54 or 58.

11-2.2 Recirculating systems shall be listed with a testing labora- tory. There shall be no substi tution or exchange of cooking appliances, filter components , blower components , or fire extin- guishing system componen t s that would violate the listing of the appliance.

11-2.3 A single recirculating system shall not use a fryer(s) exceeding a total cooking surface area of 400 sq in. or exceed a total of 22 kW or 75,000 B t u / h r input or use appliances that exceed a total of 55 kW or 187,700 B t u / h r input.

11-2.4 Open broilers and open conveyor-type ovens and broilers shall no t be permitted.

Exception No. 1: Open conveyor-type ovens used for warming or baking products that do not produce grease-laden vapors.

Exception No. 2: Open conveyor-type ovens used exclusively for baking pizza.

11-2.5 Afire-actuated dampe r shall be installed at the exhaust outlet of the system. The dampe r shall be constructed of at least the same gauge as the shell. The actuat ion device shall have a m a x i m u m tempera ture rating of 286°F (141°C).

11-2.6 No electrical wiring is to be installed in the interior sections of the hood p l enum that may become exposed to grease.

11-2.7 The power supply for any electrostatic precipitator (ESP) sball be of the "cold spark" ferro-ressonant type in which the voltage falls offas the current draw of a shor t increases.

11-2.8 Listing evaluation shall include the following: (a) Capture and con ta inmen t of vapors at published and labeled

airflows, (b) Grease discharge at the ~xhaust outlet of the system not to

exceed an average of 5 m g / m " of exhausted air sampled at m a x i m u m product capacity over a cont inuous 8 hr test per EPA Test Method 202, Determinat ion of Condensible Particulate Emissions f rom Stationary Sources.

(c) Listing and labeling of clearance to combustibles f rom all sides, top, and bottom,

(d) Electrical connect ion in the field only with p e r m a n e n t wiring to an appropriately sized disconnect or junc t ion box.

11-3 Interlocks. The recirculating system shall be provided with interlocks of all critical componen t s such that if any of these are interrupted, the cooking appliance shall no t be able to operate.

11-3.1 All closure panels encompass ing airflow sections shall have interlocks to assure the panels are in place and fully sealed.

11-3.2 Each filter c o m p o n e n t (grease and odor) shall have an interlock to prove the c o m p o n e n t is in place.

11-3.3 EachESP shall have a sensor to prove its per formance is as designed, with no interrupt ion of the power to exceed 2 min. This sha l lbe a manua l reset device or circuit.

11-3.4 An airflow switch or t ransducer shall be provided between the last tilter c o m p o n e n t and the exhaus t fan to ascertain that a m i n i m u m airflow is maintained. This device is to open the interlock circuit when the airflow falls a m i n i m u m of 10 percent below its listed m i n i m u m rating. This shall be a manua l reset device or circuit.

114 Location and Application Restrictions. The location of recirculating systems shall be reviewed by the anthori ty having jurisdiction. Items to be reviewed shall include, bu t no t be limited to, life safety, combustibility of surroundings , proximity to air vents, and total fuel load.

11-5 Additional Firesafety Requirements . 11-5.1 In addit ion to the appliance nozzle(s), there shall be a fire

ext inguishing nozzle ins ta l ledimmediate ly before or after the first grease filter, and between the last grease or odor filtration unit and the blower.

11-5.2 In addit ion to any other fire ext inguishing system actuation device, there shall be a fire ext inguishing system actuation device installed downstreana of any ESP.

11-5.3 If no t covered by 7-3.1.4, there shall be a smoke or fire detector located above the recirculating system that will sound an alarm in the immedia te vicinity and in the manager ' s office.

11-5.4 Requirements of Section 7-5 shall also apply to recirculating system locations.

11-6 Use and Maintenance. 11-6.1 Automat ic or manua l covers on cooking appliances,

especially fryers, shall no t interfere with the application of the fire suppression system.

11-6.2 The primary grease filter (the first filter in line) shall be cleaned a m i n i m u m of once per day.

11-6.3 Any ESP(s) shall be cleaned a m i n i m u m of once per week following the manufac tu re r ' s c leaning instructions.

11-6.4 Tbe entire hood p l enum and the blower section shall be cleaned a m i n i m u m of once every three months .

11-6.5 Inspection and testing of the total operation and all safety interlocks shall be per formed a m i n i m u m of once per m o n t h in accordance with the manufac ture r ' s instructions.

11-6.6 A signed and dated log of ma in tenance per formed in 11-6.3 th rough 11-6.5 shall be available on the premises for the authority' having jurisdiction. SUBSTANTIATION: None. COMMITTEE ACTION: Accept in Principle.

Delete first two introductory Tentative Inter im A m e n d m e n t (TIA) paragraphs. Make changes to 11-2.3, 11-2.4, 11-2.8(b), 11-3.4, and 11-6.6 as acted on in subsequen t proposals. Make dais Chapter 10 so that revised Chapter 10 on Recirculating Systems reads as follows:

1. Add definit ion to Section 1-2 as follows: "Recirculating Systems. Systems for control of smoke or grease-

laden vapors f rom commercial cooking equ ipmen t that do not exhaust to the outside."

2. Add new Chapter as follows: Chapter 10 Recirculating Systems

10-1 Recirculating systems containing or for use with appliances used in processes producing smoke or grease-laden vapors shall be equipped with componen t s complying with the following:

(a) The clearance requi rements of 1-3.2, (b) A hood complying with the requi rements of Chapter 2, (c) Grease removal devices complying with Chapter 4, (d) The air movemen t requi rements of Chapter 5, Exception: 5-2.1

and 5-2.3. (e) Auxiliary equ ipmen t (such as particulate and odor removal

devices) complying with Chapter 6, (f) Fire ext inguishing equ ipmen t complying with the requirements

of Chapter 7, Exception: references to ducts. (g) The use and main tenance requi rements of Chapter 8, (h) The m i n i m u m safety requi rements of Chapter 9, (i) All the special requi rements of Chapter 10. 10-2 Design Restrictions. All recirculating systems shall comply

with the following: 10-2.1 Only gas or electric fueled cooking apl?liances shall be

incorporated. Gas fueled appliances shall no t have the combust ion flue outlet(s) directly connec ted to the recirculating system. Gas fueled appliances shall have a m i n i m u m 18 in. (457.2 mm) clearance f rom the flue outlet to the filter inlet in accordance with subsect ion 4-2.2 and shall mee t the installation requi rements of NFPA 54 or 58.

10-2.2 Recirculating systems shall be listed with a testing labora- tory. There shall be no substi tution or exchange of cooking appliances, filter components , blower components , or fire extin- guishing system componen t s that would violate the listing of the appliance.

10-2.3 A single recirculating system shall no t use cooking equ'p- men t exceeding the following limits of total cooking surface areas (sq in.), electric inpu t (kW), or gas inpu t (Btu/hr) : Fryers/400 sq in., 22 kW, 75,000 Btu /hr ; Grills/1600 sq in., 30 kW, 68,200 Btu /hr ; Other equ ipmen t /2200 sq in., 55 kW, 187,700 Btu /br .

NOTE: Total cooking surface means both sides of two sided cooking equipment , and the total floor area of ovens and deck ovens. Input refers to power for beating, no t control.

260

N F P A 96 1 F93 T C R

10-2.4 O p e n broilers and open conveyor-type ovens and broilers shall no t be permit ted.

10-2.5 Afire-actuated dampe r shall be installed at the exhaust outlet of the system. The dampe r shall be constructed of at least the same gauge as the shell. The actuat ion device shall have a m a x i m u m tempera ture rating of 286°F (141°C).

10-2.6 No electrical wiring is to be installed in the interior sections of the hood p l e n u m that may become exposed to grease.

1 0-2.7 The power supply for any electrostatic precipitator (ESP) shall be of the "cold spark" ferro-ressonant type in which the voltage fails off as the cur ren t draw of a shor t increases.

10-2.8 Listing evaluation shall include the following: (a) Capture and con ta inmen t of vapors at publ ished and labeled

airflows, (b) Grease discharge at th%exhaust outlet of the system no t to

exceed an average of 5 m g / m " of exhaus ted air sampled at maxi- m u m product capacity over a cont inuous 8 h r test per EPA Test Method 202, Determinat ion of Condensible Particulate Emissions f rom Stationary Sources, with its system operat ing at its m i n i m u m listed air flow.

(c) Listing and labeling of clearance to combustibles f rom all sides, top, and bottom,

(d) Electrical connect ion in the field only with p e r m a n e n t wiring to an appropriately sized disconnect or j unc t ion box.

10-3 Interlocks. The recirculating system shall be provided with interlocks of all critical componen t s such that f f any of these are interrupted, the cooking appliance shall no t be able to operate.

10-3.1 All closure panels encompass ing airflow sections shall have interlocks to assure the panels are in place and fully sealed.

10-3.2 Each filter c o m p o n e n t (grease and odor) shall have an interlock to prove the c o m p o n e n t is in place.

10-3.3 Each ESP shall have a sensor to prove its per formance is as designed, with no in ter rupt ion of the power to exceed 2 min. This sha l lbe a manua l reset device or circuit.

10-3.4 An airflow switch or t ransducer shall be provided between the last filter c o m p o n e n t and the exhaust fan to ascertain that a m i n i m u m airflow is maintained. This device is to open the interlock circuit when the airflow falls a m a x i m u m of 10 percent below its listed m i n i m u m rating. This shall be a manua l reset device or circuit.

10-4 Location and Application Restrictions. The location of recirculating systems shall be reviewed by the authori ty having jurisdiction. I tems to be reviewed shall include, bu t no t be limited to, life safety, combustibility o f surroundings , proximity to air vents, and total fuel load.

10-5 Additional FiresatSetyRequirements. 10-5.1 In addit ion to the appliance nozzle(s), there shall be a fire

ext inguishing nozzle installed immediate ly before or after the first tgrl ezse filter, and between the last grease or odor filtration uni t and

le blower. 10-5.2 In addi t ion to any other fire ext inguishing system actuat ion

device, there shall be a fire ext inguishing system actuation device installed downst ream of any ESP.

10-5.3 f f n o t covered by 7-3.1.4, there shall be a smoke or fire detector located above the recirculating system that will sound an alarm in the immedia te vicinity and in the manager ' s office.

10-5.4 Requ i rements of Section 7-5 shall also apply to recirculating system locations.

10-6 Use and Maintenance. 10-6.1 Automat ic or manua l covers on cooking appliances,

especially fryers, shall no t interfere with the application of the fire suppress ion system.

10-6.2 The primary grease filter (the first f iher in line) shall be cleaned a m i n i m u m of once per day.

1 0-6.3 Any ESP (s) shall be cleaned a m i n i m u m of once per week following the manufac tu re r ' s c leaning instructions.

10-6.4 The entire hood p l e n u m a n d t h e blower section shall be cleaned a m i n i m u m of once every three months .

10-6.5 Inspect ion and testing of the total operation and all safety interlocks shall be per formed a m i n i m u m of once per m o n t h in accordance with the manufac tu re r ' s instructions.

10-6.6 A s i g n e d and dated log of ma in tenance pe r fo rmed in 10-6.4 th rough 10-6.5 shall be available on the premises for the authori ty having jurisdict ion.

R e n u m b e r existing Chapter 10 Referenced Publications to the last chapter before the appendices. COMMITrEE STATEMENT: This chapter on Recirculating Systems was added to the 1991 edition of NFPA 96 as a Tentative Inter im A m e n d m e n t (TIA), issued by the Standards Council on October 4, 1991. The commit tee acted on several public proposals to modify sections of the chapter and also a commit tee proposal to r e n u m b e r the former Chapter 11 to Chapter 10. The changes to sections accepted in subsequen t proposals have been included in

Chapter 10 above so that the complete text could be referenced as proposed by the commit tee for inclusion in NFPA 96.

(Log # 2) 96 - 95 - (11-2.2 th rough 11-6.2): Reject SUBMITTER: Harry L Zimmerly, BK Industries RECOMMENDATION: Add the following new sections as follows:

Title. Since the ductless hood could be supplied separately f rom the appliance, we r e c o m m e n d the use of the te rm ductless h o o d rather than Self Conta ined Cooking Appliance System (SCCAS).

Revise 11-2.2 to read as follows: "If the hood is separate f rom the appliance, provision mus t be

made to attach the appliance to the hood. The a t t achment means mus t be detachable to allow cleaning beh ind the appliance and inspection of the hood, should that be necessary."

Revise 1 I-2.3 to read as follows: "Unless tested by a recognized testing agency, only a single vat fryer

not exceeding 16 in. wide and not containing more than 3 gal of shortening, or a single griddle or oven not exceeding 36 in. wide and 14 KW may be included in a ductless hood system. Units tested and certified by a recognized agency shall conform to the size restrictions established by that agency."

Revise 11-2.5 to read as follows: "A fire link operated damper , an electrically operated damp e r with

~]pf ing return or o ther positive means of s topping the flow of air rough the ductless bood is to be installed in the ductless hood.

This dampe r is to close in the event of a fire inside the ductless hood or in the event of a trip of the fire suppression system."

Delete 11-2.6 Delete 11-2.7. 11-3.3 and 11-3.4 Clarification should be included that removal

and cleasfing of the filter, or o ther action which returns the ductless hood to proper operation, shall be acceptable as a means of manual reset.

11-3.5 I fa "fire suppress ion pressurized and armed" interlock is deemed necessary, this r equ i r emen t should be in a general section, such as a new Section 7-1.3, applicable to all fire suppress ion systems in any type of hood.

Revise 11-4.1 as follows: "Ductless hood coverage g a y not exceed 100 Ib of shor ten ing per

20 ft x 30 f t x 8 ft (4,800 ft ~) of space. If the area is greater, the proport ion of shor ten ing size or n u m b e r of hoods may be increased proportionately. For example, in a room 40 ft x 30 f t x 8 ft a m a x i m u m of 200 lb of shor ten ing could be covered by ductless hood systems.

Delete 11-4.2. Revise 11-4.3 to read as follows:

"Power inpu t may not exceed 25 KW per 20 ft x 30 ft x 8 ft (4,800 ft ) of space, ff the room volume is larger, the power inpu t may be

increased proportionately. Separate means mus t be provided for removing the heat f rom the room.

Revise 11-4.5 to read as follows: "Unless otherwise established by recognized testing agency test, a

clearance of 18 in. mus t be provided between the ductless hood and may combustible construct ion to the sides of the ductless h o o d and any combustible construct ion to the sides of the ductless hood and above the ductless hood in areas not in the air exhaus t stream. A clearance of 5 ft mus t be provided between the ductless hood and combustible construct ion in the exhaus t s t ream except as noted in Appendix A.

11"l.6 While we agree that the ductless h o o d should not be located near a re turn air register, we see no problem with locating the ductless hood near an air supply register.

11-5.3 Our observation of fire tests on units indicates the only path of egress should be considered for the manua l operator.

Delete 11-5.4. 11-6.2 Since the grease filters used here are generally identical to

those used on a conventional hood, this requirement , if really necessary, should also be applied to conventional hoods and stated in Chapter 8. We prefer, however, wording as stated in Section 8-3.1 with the associatedfootnote . SUBSTANTIATION: Since the meet ing we have contacted the South Carolina State Fire Marshal who referred us to Major R. A. Sapp, of the Mauldin Fire Depar tment . We have consulted with him to obtain an analysis of the ductless hood that we manufac tu re and

~ eneral areas of concern relating to fire protection in ductless odds. As a result of our own experience with the ductless hood, informa-

tion gained from the NFPA 96 meet ing on ductless hoods and our discussion with Major Sapp, the following comment s on the proposed TIA are men t ioned above.

261

N F P A 96 1 F 9 3 T C R

Title. By do ing dais, the s tandard will also apply to those hoods that are not suppl iedwith the appliance. For your reference, enclosed is a brochure on a free s tanding hood system that is no t supplied with the appliance.

l 1-2.2 Rather than having a single appliance used unde r a ductless hood, it is feasible, within all safety considerations, to make the hood usable for n u m e r o u s appliances, within size and per formance constraints des ignated by the recognized testing agency. This would be especially true for a h o o d having a pre-engineered fire suppres- sion system. We would, therefore, prefer to see this re-wordedas follows:

11-2.3 The section, as stated, is design restrictive when applied to certified ductless hoods. The size restriction may be reasonable if the hood ' s fire suppression system has no t been tested and design certified by a recognized testing agency.

W h e n a recognized testing agency is involved, the established design parameters should be utilized to insure a safe and effective design suitable to the application for which the hood and appliance are intended. One example of this would be the manufac tu re r request ing a specified vat area, volume and electrical rating. The recognized testing agency would then per form the necessary tests to insure that the specified values are safe.

11-2.5 Al though the descript ion in this could be easily adapted, it is felt that al ternate designs may also be possible that do not fall within the realm of the description offered. The phrase "or o ther positive means of s topping the air flow th rough the ductless hood" would cover dais. The location of the dampe r is not as impor tan t as the fact that it stops airflow th rough the appliance; therefore, the reference to the discharge of the blower is also design restyictive.

11-2.6 Problems that could arise due to exposure to grease are c o m m o n to both duc ted and ductless hood systems. Exclusion of electrical wiring and componen t s f rom the ductless hood is already adequately covered in Section 6-2.2 and need not be re-stated. 11-2.7(e) The concentra t ion of vapors making up odors is so low

that flammability of the odors is inconsequential . It is felt, therefore, that odor removal should no t be included in dais standard.

The validity of "odor units" is also quest ioned. It is essential that any ins t rumenta t ion used by testing laboratories conform to recognized standards, specifically, those traceable to NIST. While one manufac ture r may make an ins t rument for measur ing odor, the calibration means to insure the consistency of these devices f rom one laboratory to the next and over the course of t ime mus t be in place and recognized.

11-3.3 and 11-3.4 While it was stated in the mee t ing that any manual action, such as changing a filter, would constitute a "manual reset," the test engineer may not agree on that definit ion unless it is so stated.

11-3.5 The need for this goes beyond ductless hoods. 11-4.1 This section appears as if it is in tended to eliminate all use

of ductless hoods. The need for ductless hoods is very m u c h evident in existing multiple uni t buildings, unde rgo ing remodel ing, where providing proper duct ing for a ducted h o o d is no t feasible. Instead of this requirement , it is felt that a m a x i m u m n u m b e r of ductless hoods per room volume be specified.

11-4.2 It is felt that this r equ i rement is u t l founded in light of the interlocks required on the ductless systems that insure proper operation of the filtration system.

11-4.3 As with the limitations proposed for 11-4.1, dais restriction should be imposed by size within a designated room volume.

11-4.5 The distances to combustibles are generally accepted as 18 in. in other duct systems. For walls and floors, the same shou ld apply here, unless otherwise established by recognized testing agency test. A 5 ft distance to combustible in the path of the exhaust ing air is reasonable.

11-5.3 During an actual fire, manua l operators on the front of the uni t c a n g e t too ho t to be of use.

11-5.4 The fire suppress ion requ i rements of ductless hoods are no different than those o fduc t ed hoods in this aspect. If .6 gal were required to ext inguish a fire u n d e r a ductless hood, then .6 gal would be required to ext inguish a fire unde r a ducted hood_ If a s ta tement requir ing a m i n i m u m a m o u n t of suppressant to enter the fry pot is d e e m e d necessary, it must, therefore, be included in a general section, applicable to all types of hoods, such as a new Section 7-3.1.4. We feel, however, that Sections 7-2.1.1.1 and 7- 2.1.1.2 sufficiently cover the needs of both ducted and ductless hoods. Section 11-5.4, therefore, should be eliminated. COMMITrEE ACTION: Reject. COMMITI'EE STATEMENT: Recommenda t ions have already been dealt with th rough the Tentative Inter im A m e n d m e n t (TIA) process and submit ter ' s concerns have been addressed. See also 96-94 (Log #12).

(Log # 44) 9 6 - 9 6 - (11-2.3 (TIA91-1)): Reject SUBMITTER:Jeffrey C. Manley, Giles Enterprises, Inc. RECOMMENDATION: Delete 11-2.3 f rom TIA 91-1. SUBSTANTIATION: Size Restrictions are covered in paragraph 11 2.2 which states "There shall be no substitution or exchange of cooking app l i ances . . . Tha t would violate the listing of the appli- ance." Listing ensures the recirculating system meets all the fire safety and vapor capture, con ta inmen t and removal requirements for the appliance selected. All safety requi rements must be me t for listing purposes regardless of the appliance size. COMMITrEE ACTION: Reject. COMMITTEE STATEMENT: Submitter has not submit ted substantiation to change the size requi rements for recirculating systems.

( L o g # 61) 96 - 97 - (11-2.3): Accept SUBMITTER: Joseph N. Knapp, McDonald ' s Corp. RECOMMENDATION: Revise text as follows:

"A single recirculating system shall no t use cooking equ ipment exceeding the following limits of total cooking surface areas (sq in.), electric inpu t (kW), or gas inpu t (Btu /hr ) : Fryers/400 sq in., 22 kW, 75,000 Btu /h r ; Grills/1600 sq in., 30 kW, 68,200 Btu /h r ; Other equ ipmen t /2200 sq in., 55 kW, 187,700 Btu /h r .

NOTE: Total cooking surface means both sides of two sided cooking equipment , and the total floor area of ovens and deck ovens. Input refers to power for heating, no t control." SUBSTANTIATION: To put reasonable limits on grills and other e ui merit that mi h t be applied in C L ~ f I T r E E A C ~ O N : Accept. these applications.

(Log # 29) 96 - 98 - (11-2.3 and 11-2.4): Reject SUBMITTER: Cam Cote, Wells Manufactur ing Co. RECOMMENDATION: Revise the following text:

Section 11-2.3 A single recirculating system shall no t use a fryer(s) exceeding a total cooking surface area of 400 sq in. or exceed a total of 22 kW or 75,000 B t u / h r input or use appliances that exceed a total of 55 kW or 187,700 B t u / h r input.

Section 11-2.4 Open broilers and open conveyor-type ovens and broilers shall no t be permitted. SUBSTANTIATION: My comments regarding these sections are since any a m o u n t of commercial cooking equ ipmen t represents a very real risk of fire, rather than limit the a m o u n t of equipment , the code should dictate a h o o d structure capable to contain any potential fire regardless of cooking configurat ion or capacity.

This m e t h o d would challenge all manufac ture rs of this type of product to produce the safest possible system rather than simply restricting applications with arbitrarily selected equ ipmen t configu- rations and capacity limits. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: The submit ter identified existing text and c o m m e n t e d (substantiation), but did not make a specific r ecommenda t ion .

(Log # 108) 96 - 99 - (11-2.4): Accept SUBMITTER: Technical Commit tee on Venting Systems for Cooking Appliances RECOMMENDATION: Remove Exceptions 1 and 2 f rom subsec- tion 11-2.4. This is also identified as 10-2.4 in 96-94 (Log # 12) that proposed adding Chapter 11 of the former TIA into NFPA 96 ,as Chapter 10. The revised 11-2.4 (or 10-2.4) will read as follows:

11-2.4 Open broilers and open conveyor-type ovens and broilers shall no t be permit ted. SUBSTANTIATION: The in tent for adding exceptions 1 and 2 for 11-2.4 after originally submit ted the TIA without those allowances was because of considerable c o m m e n t f rom the manufac turers of recirculating systems that indicated once in use, this type of cooking equ ipmen t could not easily be used for both baking and broiling operations.

262

N F P A 96 - - F93 T C R

Recent industry publications have shown that large operators are n o w doing meat broiling operat ions in the same conveyor units that they traditionally have baked pizza and bread in w i ~ o u t having to change any cooking equ ipment / ins ta l l a t ion requirements .

Therefore, because the informat ion the commit tee acted upon when creating these exceptions has proven to be e r roneous and because there is no simp)e mechan i sm for deal ing with the increased hazard of broiling meats in these units after a permit has been issued; these exceptions shou ld be rescinded. COMMITTEE ACTION: Accept.

(Log # 62) 96- 100 - (11-2.8(b)): Accept in Principle SUBMITTER:Joseph N. Knapp, McDonald ' s Corp. RECOMMENDATION: Revise text as follows:

"Grease discharge at the exhaus t outlet of the system no t to exceed an average concentra t ion of 5 m g / d r y s t a n d a r d Cu M (176.55 r ag / dry s tandard Cu Ft), nor an emission rate of 6000 m g / h r of total exhaus ted air, sampled at m a x i m u m rated effluent output , and at m i n i m u m rated exhaus t flow." SUBSTANTIATION: Toprov ide clarification of the operat ion of the equ ipmen t for rating, a r l d t h e limits of its permit ted effluent. COMMITTEE ACTION: Accep t in Principle.

Add to the end of 11-2.8(b) "with its system operat ing at its m i n i m u m listed air f low"

Revised 11-2.8(b) will read as follows: (b) Grease discharge at th%exhaust outlet of tl~e system not to

exceed an average of 5 m g / m " of exhausted air sampled at maxi- m u m product capacity over a cont inuous 8 h r test per EPA Test Method 202, Determinat ion of Condensible Particulate Emissions f rom Stationary Sources, with its system operat ing at its m i n i m u m listed air flow. COMMITTEE STATEMENT: To fur ther clarify the operation of the equ ipmen t for rating.

(Log # 45) 96 - 101 - (11-3.4 (TIA 91-1)): Reject SUBMITTER:Jeffrey C. Manley, Giles Enterprises, Inc. RECOMMENDATION: Move paragraph 11-3.4, f rom Chapter 11 to Chapter 5. SUBSTANTIATION: Insurance tha t air flow does not fall below a hoods m i n i m u m label rating is a concern for all exhaust systems, since vapors no t captured by the exhaust system are emit ted into the room. COMMIT'FEE ACTION: Reject. COMMITTEE STATEMENT: The commit tee felt that the funda- mental differences between recirculating systems and exhaust systems that vent to the outside prec luded the need to expand the r equ i r emen t to cover a![I types of cooking operations.

(Log # 63) 96 - 102 - (11-3.4): Accept in Principle SUBMITTER:Joseph N. Knapp, McDonald ' s Corp. RECOMMENDATION: Change the word "min imum" in the second sentence to "maximum." SUBSTANTIATION: To have tlae wording agree with the clear and obvious in ten t of this section. COMMITrEE ACTION: Accept in Principle.

Change the first "min imum" in the second sentence, only, to m a x i m u m so tha t revised section reads as follows:

11-3.4 An airflow switch or t ransducer shall be provided between the last filter c o m p o n e n t and the exhaus t fan to ascertain that a m i n i m u m airflow is maintained. This device is to open the interlock circuit when the airflow falls a m a x i m u m of 10 percent below its listed m i n i m u m rating. This shall be a manua l reset device or circuit. COMMITTEE STATEMENT: Clarification of submit ter ' s intent.

(Log # 30) 96- 103- (11-4): Reject SUBMITTER: Cam Cote, Wells Manufac tur ing Co. RECOMMENDATION: Revise the following text:

Section 11-4 Location and Application Restrictions. The location of recirculating systems shall be reviewed by the Authori ty Having Jurisdiction. Items to be reviewed shall include, but not be limited to, life safety, combustibility of surroundings , proximity to air vents and total fuel load. SUBSTANTIATION: A possible concern for limiting cooking equ ipmen t lines is the addit ional hea t load within the building. This concern is best addressed in Section 11-4 as each installation will vat T greatly in regard to type of bui lding cooling system, cooking equ ipmen t line-up, cooking load, ki tchen size, etc. Ano the r concern is the operator retrofitting in any piece of

cooking equ ipmen t in future years. Thus, a recirculating h o o d should be capable of hand l ing any type of equ ipmen t and be as safe as a s tandard hood and regulated on the same standards. COMMITrEE ACTION: Reject. COMMITTEE STATEMENT: The submit ter identified existing text and c o m m e n t e d (substantiation), bu t did no t make a specific r ecommenda t ion .

(Log # 31 ) 96- 104- (11-5.3): Reject SUBMITTER: Cain Cote, Wells Manufactur ing Co. RECOMMENDATION: Revise the following text:

Section 11-5.3 If not covered by 7-3.1.4, there shall be a smoke or fire detector located above the recirculating system that will sound an alarm in the immediate vicinity and in the manager ' s office. SUBSTANTIATION: My comment s regarding this section are that a recirculating hood system mus t be capable of conta in ing and ext inguishing any potential fire hazard as well as a conventional hood system. Thus, if proper con ta inmen t and ext inguishing are provided, the addit ional smoke or fire detector would no t be required.

It is my view that the identified sections unfairly restrict trade for equ ipmen t that mee t s tandards as they apply to conventional systems. COMMITrEE ACTION: Reject. COMMITTEE STATEMENT: The submit ter identified existing text and c o m m e n t e d (substantiation), but did no t make a specific r ecommenda t ion .

(Log # 43) 96- 105- (11-6.1 (TIA 91-1)): Reject SUBMITTER:Jeff ley C. Manley, Giles Enterprises, Inc. RECOMMENDATION: Move paragraph 11-6.1 f rom Chapter 11 to Chapter 8. SUBSTANTIATION: Interference between automatic or manual covers on cooking appliances and the Fire Suppress ion system should be a major concern for all exhaust systems. COMMITTEE ACTION: Reject. COMMITTEE STATEMENT: Informat ion is addressed in subsec- tion 7-4.2 of NFPA 96.

(Log # 46) 96 - 106 - (11-6.6 (TIA 91-1)): Accept SUBMITTER: Jeffrey c . Manley, Giles Enterprises, Inc. RECOMMENDATION: Change to read: " . . 11-6.4 th rough 11-6.5..

SUBSTANTIATION: Since the per formance of any ESP is moni- tored by a sensor per 11-3.3, logging of rout ine cleaning shou ld not be necessary. COMMITTEE ACTION: Accept.

263

NFPA 9 6 - - F93 TCR

(Log # 28) 96 - 107 - (Appendix A): Accept in Principle SUBMITTEI~ Phi l ipMor ton , NAFEM RECOMMENDATION: Add two new illustrations to Appendix A as shown belox~. SUBSTANTIATION: Present illustrations do no t address hoods that penetrate ceilings. This is a very c o m m o n occurrence and the addit ion of these sketches shou ld he lp clear up confusion that often occurs in this situation. C O M M I T r E E A C T I O N : Accept in Principle.

Make each drawing a detail drawing of the ceiling and h o o d so that both drawings can be shown on one page. Delete last line of drawing title on each figure. Add new Figure A-1-3.2(e) as shown on following page:

R e n u m b e r exis t ingFigures A-l-3.2(e) and (f). C O M M I T r E E STATEMENT: Commit tee agreed with submit ter bu t felt that two addit ional full drawings similar to o ther figures would add confusion.

APPENDIX A ¢ / 9-8 2 6

HINfB), LIP OISO~E

,o'- o" - I k

'-' ;F- j j J ] - 8 2 ~

\ \ 3-7 I 1" N~ [ .E~ TR~H I H~ I

THAN 4 S10121ES IN NEIC.~T - NDT LF.SS TI~N I@" ZL..E~RM~E ' 10 ~]~USI IBL~S

3-7, I 2" NOT L,E~; FR~N 2 ~ , - i,,l~'I LESS T'~t~ 5" ~ LIHITEI]

4 STORIES DR HDI~ IN HEI(~JT 3-3 4 3 3 -7 ,~ ~ PANB._ ~ DIT:~ I~W~ I H B~CH2SU~

/ / 3-7 h / ( ~ T INIIIIS

>'--I-3 2 \ O" ro HDN EOMB~TIBLE

3" TO LIHIT8) O)MB~TIBI~ ~ ~ \ \ LB" O.Ek~A~(~ TO CI]NBI~IIBI~ES

¥/NON ZI]HBI~T~I]LE UNLE~ P~TE-L~ IN kZEI]EO/C~E ~TB~IE x Wild EXEB~II[]N NQ 2 D~ ]

/ , [ -3 .2; O" 10 ~ I 3" TO Lll~rI~ C04BL~TIBI.E / L ~ IB" ~ TO C~TI~ES UNL~S ~ IN ~ ~t~ WITH E~TTQN ND. 20~ 3. /

/ 3-7 I

THI~ ~NI SINEE FI~ i~TB3 ~ I L I N 5 ~.~EMBLY

I" I

TYPICAL SECTION VIEff

FOR BUILDING WITH TWO STDRIES OR ~O~E WITH FIRE RATEI] FLOOR/CEILING ASSEMBLY

DATE 0~-~] -92 WITH HOOD PENAT~ATINO CEILING

APPENDIX A

h

¢ I ~ ~E.%I~T~O~ R)~ BIJ[IOI.NG ~ C@Q~TISL~ 4 S ~ OR MO~ IN ~I@q~ - NOT LESS ]~4/wN 6" TO L1H1TEO

3" ~ LIMI~D COMBUSTIBLE x 18" [L,E~IP*M,(.E TO ~ I ISLES

\ L.N_E~S pK:'OT~CTL~ IN .~{ C]~I~ANEE]

SEJ~.~ AR~IINB HOOD ~ I W/ N(~ C(]MB~T~ / / / '

/ 3-7 [ THIS POINT Slt(E FI~E ~TB3 FLO0~

DArE 05- 30-g2

TYPICAL SECTION VIEW FZ]I2 B U I L D I N G WITH TWO STO~IES DR M(]~E 'WITH NON F I R ~ RATE(] C E I L I N G & FIRE RATE0 FLOOR wITH HOnD PENATRATING CEILING

264

N F P A 96 - - F93 T C R

EEILI~ ASSEMBLY ~ ~ ~ DUET

I-3 2. O" T° ~[q CI]M~J~TIBLE

~EALEO ER()JNO F@[I] - 18° CLEA~#~IZE TO C[)~B~STIBLE~ w/ NON C{~M@U%TABLE UNLE~ P~'O~L=CTEO IN ~C{:I]RI]~EE ~EH~I4L EXZEPTIfN Nil, 2 ~ 3,

i-3 2 0" T° N0N CfI'~USIIBL~ 3" TD LI~ITE° CD~TI~E / " ~ IB" ~E~AN(:E In CI)~@USTIBLES UNLES~ P~]TECTEO IN ~CC[~OANEE EXHAUST ~]{]0 ~--% wITH EXCEPTIfN Nil. £ I~ ]

3-7 I' / /

SEAL I:~ AROUNO THE OLICT AT THIS POINT SINCE FII~E EATEO FLOfR~ILIN~ ASS£14BLY

TYPICAL SECTION VlE~

FOR BUILOINC, WITH TWO STORIES OR MORE WITH FIRE RATEO FLnOR/CEILING A~SEMBLY

UNLE~ PR~IET~ IN ~:CI}~{:E ~ I " '

" , 1 UNLESS I~IJI~CTED IN ~CC~/LNCE ~AIN~IcEILING / / . \ \ ~ WITH EXEEPTION NO, 2 OR 3

~JLL~ AR@JNO H[I]O

MAIERIAL F3}~QJS T HII]O

?

TYPICAL SECTION VIEW

--E~ BUILDING WITH TWD ~TORIES nR ~ORE WITH ",JON FI~E RATEO CEILING & FIRE RATED FLO~R

F'gure A-l-3.2(e)

(Log # 72) 96 - 108 - (Figures A-1-3.2(e) and (f)): Reject SUBMITTER: F. B. Hutto, Jr., Pabco R&D RECOMMENDATION: Delete Figure A-1-3.2(e) and Figure A-1- 3.2(0. SUBSTANTIATION: Based on the fact that 18 in. clearance to combustibles is unsafe, these designs are unsafe. Video evidence was p rese_nted at the March 31, 1992 NFPA meeting in Quincy, MA. (.;OMMITI'EE ACTION: Reiect. COMMIITEE STATEMENT: The committee felt that further study of the 18 inch clearance issue was necessary and aTask Group was named to review all a~filable data on the subject.

(Log # 85) 96 - 109 - (Figure A-l-B.2(a)): Accept SUBMITT£R: John K. Bouchard, SedgwickJames of N.E. RECOMMENDATION: Add a new note to Figure A-l-3.2(a) as follows:

"Enclosure not required in one-story building when roof or roof- ceiling assembly does not have a fire resistance rating."

See figure A-1.3.2(a) on following page.

SUBSTANTIATION: This is the onlyfigure shown without an enclosure. Recommended note is to emphasize the difference between this figure and other figures and to illustrate the condition described in Section 3-7.1 when an enclosure is not required. COMMITrEE ACTION: Accept.

(Log # 86) 96- l lO- (Figures A-1-3.2(b) & (c)): Accept

i S U B M Y I ' ~ J o h n K. Bouchard, SedgwickJames of N.E. RECOMMENDATION: Revise Figures A-l-3.2(b) and (c) to show enclosures extending through the ceiling as shown on following

endos ures as continuous through the ceiling. COMMITTEE ACTION: Accept.

265

NFPA 96-- F93 TCR

4 10'-0'"

3-8.2.2

\ \ \ \ \ \ \ N

3-5.1: Grease duct

Ceiling

1-3.2: 0" To noncombustibles 3" To limited-combustibles 18" Clearance to combustibles unless protected in accordance with exception no. 2 or 3,

Note: Enctosure is not required in one-story building when roof or roof-ceiling assembly does not have a fire resistance rating.

3-8.2.6 Hinged, up-discharge exhaust fan

t /

\ ~ __ _J

~ ' - - - - 3-8.2.3

40"

\ see Note

% %

\

\

\ !\,

~ ' ~ 1-3.2: O" To noncombustibles 3" To limited-combustibles 18" Clearance to combustibles unless protected in accordance with excep1~ion no. :2 or 3,

Figure A-l-3.2(a) Typical section view for one-story building without fire-rated roof-ceiling assembly.

266

N F P A 96 - - F 9 3 T C R

,0._o- / q

3 -8 .2 .2 I

3 -7 .1 : ~ " Weather p ro tec ted

R o o f obening

\ \-~\ \ \ \ \ r _1

3-7 .1 .1 ; N o t mess than 1 -h r - I f i re resistance fo r bu i ld ing i I less than 4 stories in he ight

3 -7 .1 .2 : N o t leSl than 2 - h r . -D~ f i re resistance fo r bu i ld ing 4 stories or more in he ight

3 -3 .4 .3 : Access panel

,,, \ \ \ " , , \ \ F i re- rated f l o o r / Con t inuous cei l ing assembly enclosure

1-3.2: 0 " TO noncombustibles 3 " T o l im i ted-combus t ib les 18 " clearance to combust ib les unless pro tec ted in accordance w i t h except ion no. 2 or 3.

3 -7 .1 : / SeelKI a round the d u c t at this po in t since f i re - ra ted f loor /ce i l ing assembly

Exhaus t hood

b

t

~ 3 -8 .2 .6 Hinged, up-~ isch arge

fen ] ~ - q .xheost

I / 74 Y .0.. J ' \ l ~ -- - j

18"

, ~ 3--8.2.6

\ \ \ \ \ ~ 3;-7.1.3:

- N o t less then 18'" clearance to combust ib les

- N o t less then 6 " tO l im i t ed - or noncombust ib les

~"~--3-7.3 " Opening in enclosure

~ \ \ "~--,.0on0.,o,v Grease duc t

>---- 1 -3 .2 : ~ r 0,, TO noncombust ib les

3 " T o l im i ted-combus t ib les ~ j 18 " Clearance to combust ib les

unless pro tec ted in accordance w i t h excep t ion no. 2 or 3.

%

%

{

,q ,q

L:

Figure A-l-&2(b) Typical section view for building with two-stories or more with fire-rated floor-ceiling assembly.

267

NFPA 9 6 - - F93 TCR

Discharge

4 1( ~ / E x h a u s t fan

- _ _ / -3_3 .3 ,0_ , .2

~ ill.".:!;,F",, ~ ...%. .~ ~ . . . . . o a . a ,

3-8.2.3 ~ ' ~ - - ~ ' ~ 1 - ,; ~ , ~ W . t t , ar lorotectad ~ - - . o o , i l oo.o,n° /

! / ~-~.,., . . . . - ~:~ .< -,ot,a.,hao,,"c, ....... ,f -~

Fire-rated r o o f - - ~ 1-hr rated : [.~f = ~ / 1: . . . . bustibles / I l ceiling assembly k continuous 3-5.1: ] = - : I -No t lass than 6 " to l imited- I I I }

ancJo . . . . G . . . . e d u c t / . . ; ; / 0 . . . . . ombustibles __l I I I ~ , ( t a, _,.:~.~-~,~ , ~ - - ~ L ~ /

1-3.2: ~ I "I~." ' ,~:;,~,,.>~.~":* ' : ' . . : ' ; :' i ' :"[:~,;'~<' Y:]~Y~% I 3" TO limited-combustibles 0,, ~o . . . . o~b~,t~blas ! ~ ~ " . @ : ' ~ = ~ '" " ~;:.~":: ~v, !L "t ~8,, c, . . . . . . . to ~omb~,t~bles 3" TO l imited-combustibles | ,:,;~,~( " / ' ; . [ : ; ; ,-*-/ ::.~;~ ,/";u".:~:;4:;~ \ I un~e. protected in accordance 18" Clea . . . . • to combustibles J ~ " ? , }" ".~$~"-"";,;';~:~[ ~;'"'~i';','.; ~ wlth . . . . lotion no. 2 or 3.

with exCepption no 2 or 3 :: ";' " " '''''~ ('?~'" v',":,:., s[~~v;"*'~;"):~-,+, "[1 :

I ,i," i ~ : , : ! ~ "r" , '~'X': : ' ...271

E 3-7.1: Sealed around the duct at this point since f ire-rated roof-ceil ing assembly

\

Figure A-1-3.2(c) Typical secdon view for one-story building with fire-rated roof-ceiling assembly.

268