CUMULATIVE ANALYSIS OF UNIFORM MECHANICAL … Analysis/2003 UMC Cumula… · · 2007-11-05The...

CUMULATIVE ANALYSIS OF UNIFORM MECHANICAL

CODE CHANGES™

2000 to 2003

The following pages contain comments regarding the changes to the 2000 edition of the

UNIFORM MECHANICAL CODE™ (UMC™) that were made to develop the 2003 edition

of the UMC. Some of the comments made are general in nature because the existing

language was significantly changed by amendment, deletion or replacement of existing

code language. Deleted language is shown by strikeouts and new language is underlined

(when possible).

Besides minor section changes that occurred within the book to keep section numbers

consistent and in order, two general term changes were also made throughout the entire

Code book.

1) Administrative Authority Authority Having Jurisdiction

2) Chapter 16, Part II Chapter 17, Part II

Section 203.0

Administrative Authority – is the individual official, board, depart, or agency established

and authorized by the stat, county, city, or other political subdivision created by law to

administer and enforce the provisions of the mechanical code as adopted or amended. This

definition shall include the Administrative Authority’s duly authorized representative.

Authority Having Jurisdiction — The organization, office, or individual responsible for

enforcing the requirements of a code or standard, or for approving equipment, materials,

installations, or procedures. The authority having jurisdiction shall be a federal, state, local

or other regional department or an individual such as a plumbing official; mechanical

official; labor department official; health department official; building official or others having

statutory authority. In the absence of a statutory authority, the authority having jurisdiction

may be some other responsible party. This definition shall include the Authority Having

Jurisdiction’s duly authorized representative.

Analysis: The term Administrative Authority has been deleted and replaced by the term Authority Having

Jurisdiction in all of the chapters and sections of the UMC. This change was made to make the code

consistent with language used in other codes and standards. This change also makes the term consistent

with the IAPMO rules and regulations.

Section 204.0

New definitions for Brine, Building Code, and Building Official

Brine. As determined in accordance with NFPA 30

Building Code is the building code that is adopted by this jurisdiction

Building Official. See Authority Having Jurisdiction.

Analysis: This adds new required definitions to Chapter 2. The term code has been amended to make the

code consistent with language used in other codes and standards. This change also makes the term

consistent with the IAPMO rules and regulations.

Section 205.0

New definitions for Clothes Dryer, Type 1, Clothes Dryer, Type 2, Code, and

Combustion Air.

Clothes Dryer, Type I is a factory-built package, multiply produced. Primarily used in

family living environment. May or may not be coin operated for public use.

Clothes Dryer, Type II is a factory-built package, multiply produced. Used in business with

direct intercourse of the function with the public. May or may not be operated by public or

hired attendant. May or may not be coin operated.

Code – A standard that is an extensive compilation of provisions covering broad subject

matter or that is suitable for adoption into law independently of other codes and standards.


code consistent with language used in other codes and standards. These changes also make the terms


Section 214.0

Labeled refers to equipment or materials to which has been attached a label, symbol, or

other identifying mark of an organization that is acceptable to the Authority Having

Jurisdiction and concerned with product evaluation, that maintains periodic inspection of

production of labeled equipment or materials, and by whose labeling the manufacturer

indicates compliance with appropriate standards or performance in a specified manner.

Analysis: This adds a new required definition to Chapter 2. The term code has been amended to make the

code consistent with language used in other codes and standards. This change also makes the terms


Section 221.0

New definitions for Shall, Should, Standard, and Stationary Fuel Cell Power Plant

Shall indicates a mandatory requirement.

Should indicates a recommendation or that which is advised but not required.

Standard is a document, the main text of which contains only mandatory provisions using

the word "shall" to indicate requirements and which is in a form generally suitable for

mandatory reference by another standard or code or for adoption into law. Nonmandatory

provisions shall be located in and appendix, footnote, or fine-print note and are not to be

considered a part of the requirements of a standard.

Stationary Fuel Cell Power Plant is a self-contained package or factory-matched

packages that constitute and automatically operated assembly of integrated systems for

generating useful electrical energy an recoverable energy that is permanently connected

and fixed in place.


code consistent with language used in other codes and standards. These changes also make the terms


Section 302.1

Chapter 16, Part II – Referenced Standards, provides guidance as to available nationally

recognized standards. A list of accepted mechanical equipment and material standards is

included in Chapter 17, Part II.

Analysis: This change was made to reflect that Chapter 16 was moved to Chapter 17 and will make it

consistent with the wording in Section 301.1.3 of the Uniform Plumbing Code.

Section 302.3

Oil-Burning Appliances. The tank, piping, and valves for appliances burning oil shall be

installed in accordance with the requirements of standards referenced in Chapter 16, Part II

NFPA 31, Standard for the Installation of Oil-Burning Equipment.

Analysis: This section was formerly Section 303.2 in the previous version of this code and has been moved

and renumbered as Section 302.3. The change in wording is to correlate the UMC and NFPA 31, Standard for

the Installation of Oil Burning Equipment. The reference to NFPA 31 already exists in Chapter 17, Part II; this

makes the source of the requirement easier for the user to identify.

Section 303.0

Type of Fuel and Fuel Connections Connecting Gas Equipment.

Deleted existing Section 303.0 language and replaced the section with text from NFPA 54,

National Fuel Gas Code, paragraphs 8.5.1 through 8.5.3.

Analysis: This change was made to correlate the UMC and NFPA 54, National Fuel Gas Code.

Section 304.6

LPG Appliances. Liquefied petroleum gas-burning appliances shall not be installed in a pit,

basement or similar location where heavier-than-air gas might collect. Appliances so fueled

shall not be installed in an above-grade under-floor space or basement unless such

location is provided with an approved means for removal of unburned gas.

Analysis: This section was deleted since there is no justification for this prohibition and NFPA has provided

statistics in the past to demonstrate that incidents involving below grade propane incidents are not greater

than those for natural gas. A similar prohibition does not exist in NFPA 54. Installations of LP-gas appliances

are common in basements in cities and states that adopt NFPA 54.

Section 308.0

Appliances installed in garages, warehouses, or other areas where they may be subjected

to mechanical damage shall be suitably guarded against such damage by being installed

behind protected barriers or by being elevated or located out of the normal path of vehicles.

Analysis: This change was made to make the code consistent with language used in other codes and

standards. This change also makes the term consistent with the IAPMO rules and regulations.

Table 3-1, Note 11

11 A central heating boiler or furnace shall be installed in accordance with the

manufacturer’s instructions and shall be installed on a floor of noncombustible construction

with noncombustible flooring and surface finish an with no combustible material against the

underside thereof, or on fire-resistive slabs or arches having no combustible material

against the underside thereof.

Exception No. 1: Appliances listed for installation on a combustible floor.

Exception No. 2: Installation on a floor protected in an approved manner. [NFPA 54:9.3.3]

Analysis: This language was extracted from NFPA 54 Section 9.3.3 and was added as Note 11 to Table 3-1.

This change was made to correlate the UMC and NFPA 54, National Fuel Gas Code.

Section 401.0

Ventilation (outdoor) air for occupants shall be designed in accordance with ANSI/ASHRAE

62-2001.

Analysis: A reference to ANSI /ASHRAE has been added. This is the standard for outdoor ventilation

requirements.

Chapter 5

This Chapter has been extensively changed to make it consistent with the language used in

NFPA 96 Standard for Commercial Kitchen Equipment. Some of these provisions have

been extracted in their entirety. Also, there are new drawings from NFPA 96 for duct joints

and Table 5-5 and 5-6 were previously in Chapter 6 in the 2000 UMC.

Section 502.0

New definitions for:Access Panel Easily Accessible Liquidtight

Air Intakes Factory-Built Grease Enclosures Listed

Air Pollution Control Devices Field-Applied Grease Duct Enclosures Noncombustible Material

Appurtenance Fire Barrier Wall Open Combustible Construction

Automatic Fire Partition Pitched

Baffle Plate Fire Resistance Rating Recirculating Systems

Classified Fume Incinerators Removable

Clearly Identified Fusible Link Replacement Air

Closed Combustible Construction Grease Salamander Boiler

Combustible Material Grease Ducts Shall

Commercial Food Heat-Processing Equipment Grease Filters Single Hazard Area

Compensating Hood Grease Filter, Mesh Type Solid Cooking Fuel

Concealed Spaces Grease Removal Devices Solid-Fuel Cooking Equipment

Continuous Enclosure Greasetight Solvent

Continuous Weld High Boiler Spark Arrestor

Cooking Appliance Flue Outlet High Limit Control Standard

Damper Hood Termination

Detection Devices Interconnected Thermal Recovery Unit

Dips Labeled Trap

Discharge Limited-Combustible Material Upright Boiler

Analysis: New definitions from NFPA 96 have been added to aid the user to better understand the code.

Section 504.2

Ducts for domestic range hoods shall only serve cooking appliances.

Analysis: This sentence was inserted because there is currently no provision to prohibit an environmental air

fan, a domestic range hood, and a clothes dryer from sharing the same exhaust duct.

Section 504.3.1

Clothes dryer moisture-exhaust ducts shall not be connected to a gas vent connector, gas

vent or chimney, and shall serve no other appliance or exhaust system.

Analysis: This sentence was inserted because there is currently no provision to prohibit an environmental air

fan, a domestic range hood, and a clothes dryer from sharing the same exhaust duct.

Section 504.3.2.1

Exception: Approved flexible duct connectors Listed clothes dryer transition ducts not

more than six (6) feet (1829 mm) in length may be used in connection with domestic dryer

exhausts.

Flexible clothes dryer transition ducts connectors shall not be concealed with construction.

Analysis: There are clothes dryer transition ducts specifically listed for this purpose. These ducts are either

rigid or flexible. UL Subject 2158A, Outline of Investigation for Clothes Dryer Transition Duct, is used for

investigating and listing these ducts.

Section 505.1.1

Incompatible materials shall not be conveyed in the same system.

Analysis: This change is to correlate the UMC and NFPA 91, Standard for Exhaust Systems for Air Conveying

of Vapors, Gases, Mists and Noncombustible Particulate Solids.

Section 505.1.2

In systems conveying flammable vapors, gases, or mists, the concentration shall not

exceed 25 percent of the lower flammability limit (LFL).

Exception: Higher concentrations shall be permitted if the exhaust system is designed and

protected in accordance with the Standard on Explosion Prevention Systems in Chapter 17,

using one or more of the following techniques:

(a) Combustible concentration reduction

(b) Oxidant concentration reduction

(c) Deflagration suppression

(d) Deflagration pressure containment



Section 506.2 (1)

Class 1 product-conveying ducts that operate at less than four (4) inches water column

(995.6 Pa) negative pressure and convey noncorrosive, nonflammbale, and nonexplosive

materials at temperatures not exceeding 250°F (121°C) may be constructed in accordance

with Tables 6-1, 6-2, 6-3, 6-4, 6-5, 6-7, 6-8, or with prior approval, UMC Standard 6-2.

Analysis: With the changes occurring in Chapter 6, previously referenced tables were renumbered and

additional tables were added. This change is to reflect that the correct tables are referenced in Exception 1

for Product-Conveying Ducts.

Section 506.4

If a room or building contains a dust explosion hazard that is external to protected

equipment, as defined in 2.2.3.1 of NFPA 654, such areas shall be provided with

deflagration venting to a safe outside location.

Analysis: This change is to correlate the UMC and NFPA 654, Standard for the Prevention of Fire and Dust

Explosions from the Manufacturing, Processing, and Handling of Combustible Particulate Solids.

Section 506.5

Under Section 506.5, new sub-sections, 506.5.1 through 506.5.4, were inserted containing

language that was extracted from NFPA 91, paragraphs 2.5.1 through 2.5.4.



Section 506.7

Duct Clearances.Deleted existing text for Section 506.7 and replaced with the following language that was

extracted from NFPA 91, paragraphs 2.6.1 through 2.6.3.8 along with any tables or figures

that are referenced within those sections.



Part II – Commercial Hoods and Kitchen Ventilation

Section 507.0 through 517.0

The new language that was inserted in these sections has been extracted from NFPA 96.

The following are the main topics that are discussed:

Section 507.0 – General Requirements, Clearances and Alternative Methods

Section 508.0 – Hood Construction, Exhaust Hood Assemblies with Integrated Supply-Air

Plenums, Listed Hood Assemblies, and Solid-Fuel Assemblies

Section 509.0 – Grease Removal Devices in Hoods, Installation and Solid-Fuel Grease

Removal Devices

Section 510.0 – Exhaust Duct Systems, General Requirements, Non-Grease Ducts,

Clearance, Openings, Listed Grease Ducts, Materials and Installation for

Other Grease Ducts, Exterior Installations, Interior Installation, Termination

of Exhaust System, Rooftop Terminations, Wall Terminations, and Solid-

Fuel Systems

Section 511.0 – Air Movement, In-Line Exhaust Fans, Airflow, Replacement Air, Common

Duct (Manifold) Systems, and Solid-Fuel Air Movement Requirements

Section 512.0 – Auxiliary Equipment, Dampers, Electrical Equipment, Other Equipment,

and Solid-Fuel Auxiliary Equipment

Section 513.0 – Fire Extinguishing Equipment, General Requirements, Types of

Equipment, Simultaneous Operation, Fuel Shutoff, Manual Activation,

System Annunciation, System Supervision, Special Design and

Application, Review and Certification, Portable Fire Extinguishers, and

Solid-Fuel Fire Extinguishing Equipment

Section 514.0 – Procedures for the Use and Maintenance of Equipment, Operating

Procedures, Inspection, Cleaning, and Operation, Maintenance, and

Inspection of Solid Fuel Cooking Equipment

Section 515.0 – Minimum Safety Requirements for Cooking Equipment, Cooking

Equipment Approval, Installation, and Operating Controls

Section 516.0 – Recirculating Systems, General Requirements, Design Restrictions,

Interlocks, Location and Application Restrictions, Additional Fire Safety

Requirements, and Use and Maintenance

Section 517.0 – Solid-Fuel Cooking Operations, Venting Application, Location of

Appliances, Hoods for Solid-Fuel Cooking, Exhaust Systems for Solid-Fuel

Cooking, Grease Removal Devices for Solid-Fuel Cooking, Air Movement

for Solid-Fuel Cooking, Fire-Extinguishing Equipment for Solid-Fuel

Cooking, and Other Safety Requirements

Analysis: This change is to correlate the UMC and NFPA 96, Standard for Ventilation Control and Fire

Protection for Commercial Cooking Operations. NFPA 96 is nationally recognized and an applied standard.

By including a reference to NFPA 96 within the UMC, the result is a complete operational and fire protection

package for commercial cooking operations. The sections retained in the UMC are those not specifically

addressed in NFPA 96. Sections that were deleted from the UMC are those specifically addressed in NFPA

96 in greater detail.

Section 602.1

General. Supply air, return air, and outside air for heating, cooling, or evaporative cooling

systems shall be conducted through duct systems constructed of metal as set forth in

Tables 6-1, 6-2, 6-3, 6-4, 6-7, 6-8, 6-9, and 6-10, or metal ducts complying with UMC

Standard No. 6-2 or the referenced HVAC duct construction standard in Chapter 17, Part II

with prior approval. Rectangular ducts in excess of 2 inches w.g. shall comply with UMC

Standard No. 6-2 or the referenced HVAC duct construction standard in Chapter 17, Part II.

Analysis: Additional tables were inserted into Chapter 6. This section was updated to include references to

the SMACNA tables and the requirements currently used in modern rectangular duct construction up to 2-inch

water gauge static pressure.

Section 602.2

Combustibles within Ducts or Plenums. Materials exposed within ducts or plenums shall

have a flame-spread index of not more than 25 and a smoke-developed rating index of not

more than 50 when tested in accordance with the test for surface burning characteristics of

building materials. (See the building code standards based on ASTM E84-91a and ANSIUL

723-86.) as a composite product in accordance with ASTM E84 or ANSI/UL 723, Standard

for Test for Surface Burning Characteristics of Building Materials, or as a composite

product in accordance with NFPA 255 Standard Method of Test of Surface Burning

Characteristics of Building Materials, ASTM E 84-2001 or ANSI 723-96.

Analysis: This revision is a clarification for an existing requirement and to address the references to ASTM E

84, ANSI/UL 723, and NFPA 255.

Section 602.2 (1)

Return-air and outside-air ducts, plenums or concealed spaces which that serve a dwelling

unit may be shall be permitted to be of combustible construction.

Analysis: Editorial change for clarification purposes.

Section 602.2 (5)

Electrical wiring in plenums shall comply with the NFPA 70, National Electrical Code.

Analysis: Clarifies that the Electrical Code is NFPA 70, National Electrical Code since the International

Electrical Code exists as well.

Section 602.2 (5)(b)

Produce smoke having an average optical density not greater than 0.15 and having a peak

optical density of 0.5 or less when tested in accordance with UMC Standard No. 6-3 NFPA

262, Standard Method of Test for Flame Travel and Smoke of Wires and Cables for Use in

Air-Handling Spaces.

Analysis: UMC Standard No. 6-3 has been removed from the 2003 UMC. NFPA 262 is the replacement

standard since cables and sprinkler pipe are referenced.

Section 602.2 (6)(b)

Produce smoke having an average optical density not greater than 0.15 and having a peak

optical density of 0.5 or less when tested in accordance with UMC Standard No. 6-3

UL 1887, Standard for Fire Test of Plastic Sprinkler Pipe for Flame and Smoke

Characteristics.

Analysis: UMC Standard No. 6-3 has been removed from the 2003 UMC. UL 1887 is the replacement

standard since nonmetallic sprinkler pipe in plenums are referenced.

Section 602.2 (7)(8)(9)

(7) Nonmetallic pneumatic tubing in plenums shall be listed and shall meet the following

requirements:

(a) Exhibit flame travel of five (5) feet (1524 mm) or less, and

(b) Produce smoke having an average optical density not greater than 0.15 and having

a peak optical density of 0.5 or less when tested in accordance with UL 1820,

Standard for Fire Test of Pneumatic Tubing for Flame and Smoke Characteristics.

(8) Loudspeakers and recessed luminaries including their assembles and accessories in

plenums shall be listed and shall meet the following requirements:

(a) Have a peak rate of heat release not greater than 100 kilowatts.

(b) Produce smoke having an average optical density not greater than 0.15 and having

a peak optical density of 0.5 or less when tested in accordance with UL 2043,

Standard for Fire Test for Heat and Visible Smoke Release of Discrete Products and

Their Accessories Installed in Air-Handling Spaces.

(9) Smoke detectors.

Analysis: These exceptions were inserted into Section 602.2 since they are allowed in NFPA 90A, Standard

for the Installation of Air-Conditioning and Ventilating Systems.

Section 602.4

Crimp joints for residential round ducts shall have a contact lap of at least 1-1/2 inch (38

mm) and shall be mechanically fastened by means of at least three sheet-metal screws

equally spaced around the joint, or an equivalent fastening method.

Joints and seams and all reinforcements for factory-made air ducts and plenums shall meet

with the conditions of prior approval in accordance with the installation instructions that

shall accompany the products. Closure systems for rigid Class 1 air ducts and plenums

shall be listed in accordance with UL 181A, Ducts and Air Connectors. and flexible Class 1

Flexible air ducts shall conform to the referenced standards for air ducts in closure systems

in Chapter 16, Part II be listed in accordance with UL 181B, Standard for Closure Systems

for Use with Flexible Air Ducts and Air Connectors.

Analysis: Residential was deleted since crimp joints are also used in commercial and industrial applications.

With the referencing of UL 181A and 181B, Class 1 was removed because UL 181 requires both Class 0 and

1 air ducts to be installed in closure systems.

Section 602.5

Metal. Every duct, plenum, or fitting of metal shall comply with Table 6-1 or 6-2 6-8.

Exceptions:(1) Ducts, plenums, and fittings for systems serving single-dwelling units may comply with

Table 6-3 6-9.

(2) Duct systems complying with UMC Standard 6-1 6-2 or the referenced HVAC duct

construction standard in Chapter 17, Part II with prior approval or duct systems

complying with UL 181, Standard for Factory-Made Air Ducts and Air Connectors.

Analysis: Besides minor editorial changes to reference the correct tables within Chapter 6 in Exception (1), in

Exception (2), the reference to UMC Standard No. 6-1 was changed because No. 6-1 is no longer part of the

2003 UMC and was replaced by UL 181.

Section 602.6

Tin. Existing tin ducts may be used when cooling coils are added to a heating system,

provided the first ten (10) feet (3048 mm) of the duct or plenum measured form the cooling

coil discharge are constructed of metal of the gage thickness set forth in Tables 6-1, 6-2 6-

8, or 6-3 6-9 of this chapter or are of approved material and construction. Tin ducts

completely enclosed in inaccessible concealed areas need not be replaced. All accessible

ducts shall be insulated to comply with Table 6-4 6-6 of this chapter.

Analysis: Minor editorial changes to reference the correct tables within Chapter 6.

Section 604.1

Metal Ducts. Ducts shall be securely fastened in place at each change of direction and as

set forth in Table 6-5 6-7. Vertical rectangular ducts and vertical round ducts shall be

supported as set forth in Table 6-5 6-7, Part I A. Riser ducts shall be held in place by

means of metal straps or angles and channels to secure the riser to the structure.

Analysis: Minor editorial changes to reference the correct tables within Chapter 6.

Section 604.2

Factory-Made Air Ducts. Approved Listed Class 0 or Class 1 factory-made air ducts may

be installed in any occupancy covered by this code.

Analysis: Listed Class 0 and Class 1 factory-made air ducts are readily available in the industry: such ducts

need to be listed to demonstrate compliance with Section 604.0.

Section 605.0

Insulation of Ducts. Supply- and return-air ducts and plenums of a heating or cooling

system shall be insulated to achieve the minimum thermal (R) value as set forth in Tables

6-4, except for ducts and plenums used exclusively for evaporative cooling systems 6-6A

and B.

Exceptions:

(A) Factory-installed plenums, casings, or ductwork furnished as a part of HVAC equipment

tested and rated in accordance with approved energy efficiency standards.

(B) Ducts or plenums located in conditioned spaces.

(C) For runouts less than 10 feet (3 m) in length to air terminal or air outlets, the rated R

value of insulation need not exceed R-3.5 (R-0.6).

(D) Backs of air outlets and outlet plenums exposed to unconditioned or indirectly

conditioned spaces with face areas exceeding 5 sq. ft. (0.5 m2) need not exceed R-2 (R-

0.4); those 5 sq. ft. (0.5 m2) or smaller need not be insulated.

(E) Ducts and plenums used exclusively for evaporative cooling system.

Analysis: These revisions make the tables 6-6A and B easier to use by directly stating the insulation R-value

required for a given application without having to read the table footnotes. The R-value selections are

consistent with both ASHRAE 90.1 and International Energy Conservation Code.

Section 605.0

Insulation applied to the exterior surface of ducts, including duct coverings and linings,

located in buildings shall have, when tested as a composite installation in the form in which

they are used, a maximum flame spread index of not more than 25 and a maximum smoke-

density not exceeding developed index of 50 when tested as a composite installation

including insulation, facing materials, tapes and adhesives as normally applied in

accordance with NFPA 255-2000, Standard Method of Test of Surface Burning

Characteristics of Building Materials or in accordance with ASTM E 84-2000a, Standard

Test Method for Surface Burning Characteristics of Building Materials or in the provisions

of UL 723-96, Standard for Test of Surface Burning Characteristics of Building Materials.

Where these products are to be applied with adhesives, they shall be tested with such

adhesives applied.

Air duct coverings and lining shall not flame, glow, smolder, or smoke when tested in

accordance with ASTM C411-97, Standard Test Method for Hot-Surface Performance of

High-Temperature Thermal Insulation, at the temperature to which they are exposed in

service. In no case shall the test temperature be below 250°F (121°C).

Factory-made air ducts and faced insulations intended for installation on the exterior

of ducts shall be legibly printed with the name of the manufacturer, the thermal resistance

(R) value at installed thickness and the flame-spread index and smoke-developed rating

index of the composite material.

Analysis: The modified language reinstates testing of duct coverings and lining as a composite installation

and eliminates referencing panels and plenums to avoid any potential confusion. The terminology adopted by

ASTM committee E5 on Fire Standards is now clear in that the terms recommended to be used are “flame

spread index” and “smoke developed index”.

Section 606.2

Ductwork shall be connected to damper sleeves or assemblies in such a way that collapse

of the ductwork will not dislodge the damper or impair its proper operation accordance with

the fire damper manufacturer’s installation instructions.

Analysis: Due to the many types of fire dampers that are now available, this change assures that the methods

for connecting ductwork to each manufacturer’s fire damper will be addressed accordingly and allow for

proper operation of the damper and enhanced safety to the building occupants.

Section 606.3

Ceiling Radiation Dampers. Ceiling radiation dampers shall comply with the standard for

ceiling radiation dampers referenced in Chapter 16 17, Part II, and shall be installed in

accordance with manufacturer’s approved installation instructions in the fire-resistive ceiling

element of floor-ceiling and roof-ceiling assemblies when required by the Building Code.

Fire dampers not meeting the temperature limitation of ceiling dampers shall not be used

as a substitute. Ceiling radiation dampers shall be labeled by an approved agency.

Analysis: The term “radiation” was inserted throughout the section to be consistent in the terminology of

“ceiling radiation dampers”.

Section 608.0

Use of Under-Floor Space as Supply Plenum for Dwelling Units.

Analysis: Additional language was inserted into the title for clarification that the requirements of this sectiononly deal with residential occupancies.

Section 608.12

The entire ground surface of the under-floor space shall be covered with a vapor barrierhaving a minimum thickness of four (4) mils (0.1016 mm) and a flame spread rating indexof 200 or less.

Analysis: The terminology adopted by ASTM committee E5 on Fire Standards is now clear in that the termrecommended to be used is “flame spread index”.

Section 609.0 (5)

Smoke detectors that are factory installed in listed air-moving equipment may be used inlieu of smoke detectors installed in the main supply-air duct served by such equipment.

Analysis: This additional exception in Section 609.0 would allow factory installed smoke detectors in the unitinstead of the SA duct.

Section 610.0

All language in Section 610.0 regarding Product-Conveying Ducts, has been removed fromChapter 6 in the 2003 UMC.

Analysis: The exact same language is addressed in Section 506.0 of Chapter 5 in the 2003 UMC.

Tables 6-1, 6-2, 6-6A, and 6-6B

Additional of dealing with duct construction for 4 and 5 foot duct lengths and minimum ductinsulation R-values were inserted into Chapter 6 of the 2003 UMC.

Analysis: Table 6-1 from the 2000 UMC has been replaced with the new SMACNA tables (6-1 and 6-2) sincethey contain the requirements currently used in modern rectangular duct construction up to 2-inch watergauge static pressure. The R-value tables were inserted for consistency with ASHRAE 90.1 and theInternational Energy Conservation Code.

Chapter 7

Table 7-1 and all previous language except Section 702.2 in Chapter 7 of the UMC 2000

has been revised and replaced by extracted language and figures from NFPA 54, Sections

8.3 and A8.3.


Section 701.1 – General Requirements for Combustion and Ventilation Air

Section 701.2 – Indoor Combustion Air

Section 701.3 – Indoor Opening Size and Location

Section 701.4 – Outdoor Combustion Air

Section 701.5 – Combination Indoor and Outdoor Combustion Air

Section 701.6 – Engineered Installations

Section 701.7 – Mechanical Combustion Air Supply

Section 701.8 – Mechanical Combustion Air Requirements

Section 701.9 – Louvers and Grilles

Section 701.10 – Combustion Air Ducts

Section 701.11 – Dampers Prohibited (formerly numbered 702.2 in 2000 UMC)

Analysis: This change is to correlate the UMC and NFPA 54, National Fuel Gas Code. NFPA 54 is nationally

recognized and an applied standard. By including a reference to NFPA 54 within the UMC, the result is to

ease comparison of the two documents.

Chapter 8

All previous language has been deleted and replaced with new language, figures and

tables that have been extracted from NFPA 54, Chapters 10 and 13. Some tables were

also moved from the 2000 UMC Appendix C into Chapter 8.


Section 801.0 – The Scope for Venting of Fuel Appliances

Section 802.0 – General Requirements for Vents

Section 802.2 – Specifications for Venting

Section 802.3 – Design and Construction

Section 802.4 – Type of Venting System to Be Used

Section 802.5 – Masonry, Metal, and Factory-Built Chimneys

Section 802.6 – Gas Vents

Section 802.7 – Single-Wall Metal Pipe

Section 802.8 – Through-the-Wall Vent Termination

Section 802.9 – Condensation Drain

Section 802.10 – Vent Connectors for Category I Gas Utilization Equipment

Section 802.11 – Vent Connectors for Category II, Category III, and Category IV Gas

Utilization Equipment

Section 802.12 – Draft Hoods and Draft Controls

Section 802.13 – Manually Operated Dampers

Section 802.14 – Automatically Operated Vent Dampers

Section 802.15 – Obstructions

Section 803.0 – Sizing of Category I Venting Systems

Section 803.2 – Additional Requirements to Multiple Appliance Vent




Chapter 9

Some sections from this chapter have been deleted and replaced with new language,

figures and tables that have been extracted from NFPA 54, Chapter 9.


Section 902.0 – General Requirements

Section 903.0 – Air-Conditioning Equipment (Gas-Fired Air Conditioners and Heat Pumps)

Section 904.0 – Central Heating Boilers and Furnaces

Section 904.10 – Equipment on Roof

Section 905.0 – Clothes Dryers

Section 906.0 – Conversion Burners

Section 907.0 – Decorative Appliances for Installation in Vented Fireplaces

Section 908.0 – Gas Fireplaces, Vented

Section 909.0 – Non-Recirculating Direct Gas-Fired Industrial Air Heaters

Section 910.0 – Recirculating Direct Gas-Fired Industrial Air Heaters

Section 911.0 – Duct Furnaces

Section 912.0 – Floor Furnaces

Section 913.0 – Food Service Equipment, Floor Mounted

Section 914.0 – Food Service Equipment, Counter Appliances

Section 915.0 – Hot Plates and Laundry Stoves

Section 916.0 – Household Cooking Appliance

Section 917.0 – Illuminating Appliances

Section 918.0 – Incinerators, Commercial-Industrial

Section 919.0 – Infrared Heaters

Section 920.0 – Open-Top Broiler Units (formerly numbered 918.0 in 2000 UMC)

Section 921.0 – Outdoor Cooking Appliances

Section 922.0 – Pool Heaters

Section 923.0 – Refrigerators

Section 924.0 – Room Heaters (formerly numbered 916.0 in 2000 UMC)

Section 925.0 – Stationary Gas Engines

Section 926.0 – Gas-Fired Toilets

Section 927.0 – Unit Heaters

Section 928.0 – Wall Furnaces

Section 929.0 – Appliances for Installation in Manufactured

Section 930.0 – Small Ceramic Kilns (formerly numbered 920.0 in 2000 UMC)




Chapter 1020.0

Fuel Piping, Tanks, and Valves. Fuel piping shall conform to Chapter 16 Part II,

Referenced Standards - Tanks, piping, and valves for oil-burning appliances, Chapter 2

and 3 of shall be installed in accordance with NFPA 31-1978, Standard for the Installation

of Oil-Burning Equipment.

Analysis: This change is to correlate the UMC and NFPA 31, Standard for Installation of Oil-Burning

Equipment.

Section 1106.1

Human Comfort. Cooling systems used for human comfort shall comply with the return-air

and outside-air provisions for furnaces in Section 906.0 904.7 and 904.8 of this code.

Cooling equipment used for human comfort in dwelling units shall be sized to satisfy the

calculated loads determined in accordance with the reference standards in Chapter 17,

Part II or other approved methods.

Analysis: The existing text in Section 906.0 was retained because it provides guidance on return air and

outside air for cooling systems. The new requirements were limited to residential.

Section 1106.3 (4)

Cooling or refrigeration equipment, using Group A1 and B1 refrigerants or brine, located on

a roof or on an exterior wall of a building may be provided access as for furnaces in Section

910.0 904.10 of this code.

Analysis: With all the new language that was changed in Chapter 9, this change is to reflect the correct

referenced section for equipment on roofs.

Section 1107.1.2

Exceptions:

1. Systems containing less than thirty-five (35) pounds (16 kg) of refrigerant R-717 and

located in an approved exterior location.

2. Direct and indirect-fired lithium bromide absorption systems using water as the

refrigerant.

Refrigeration machinery rooms shall house all refrigerant-containing portions of the

system other than the piping and evaporators permitted by Section 1105.3, discharge

piping required of this chapter, and cooling towers regulated by this chapter, Part II, and

their essential piping.

Analysis: The 1997 UMC included provisions that required a machinery room for equipment with refrigerants

other than A1. Since Section 1107.1 requires a machinery room for A1 refrigerants, when equipment exceeds

100 HP, it is important to require protection for equipment containing refrigerants other than A1, as they are

either toxic, flammable or both. The deleted language has been moved to Section 1107.1.4 in the 2003 UMC.

Section 1107.1.4

The system contains other than a Group A1 refrigerant.

Exceptions:

(1) Lithium bromide absorption systems using water as the refrigerant.

(2) Ammonia-water absorption unit systems installed outdoors, provided that the quantity of

refrigerant in a single system does not exceed Table 11-1 amounts and the discharge is

shielded and dispersed.

(3) Systems containing less than 300 pounds (136kg) of refrigerant R-123 and located in an

approved exterior location.

(4) Systems containing less than 35 pounds (16 kg) of refrigerant R-717 and located in an

approved exterior location.

Refrigeration machinery rooms shall house all refrigerant-containing portions of the

system other than the piping and evaporators permitted by Section 1105.3, discharge

piping required of this chapter, and cooling towers regulated by this chapter, Part II, and

their essential piping.

Analysis: The 1997 UMC included provisions that required a machinery room for equipment with refrigerants

other than A1. Since Section 1107.1.2 requires a machinery room for A1 refrigerants, when equipment

exceeds 100 HP, it is more important to require protection for equipment containing refrigerants other than

A1, as they are either more toxic, more flammable or both. Exception (4) and the proceeding paragraph came

from Section 1107.1.2 in the 2000 UMC

Section 1110.3

Ferrous Materials. Iron and steel refrigeration piping, valves, fittings and related parts shall

be approved for the intended use. Pipe more than two (2) inches (50 mm) iron pipe size

shall be electric-resistance welded or seamless pipe. (See UMC Standard 11-3 in Appendix

A.)

Analysis: UMC Standard No. 11-3 has been removed from the 2003 UMC. This was an outdated transcribed

standard and was replaced by current standards referenced to make and keep the UMC current.

Section 1111.8

Identification. Piping shall be meet the reference standard for identified in accordance with

UMC Standard No. 11-2. The type of refrigerant, function and pressure shall be indicated.



Section 1112.4

Stop valves shall be identified by tagging in accordance with UMC Standard No. 11-2 the

referenced standard for identification. A valve chart shall be mounted under glass at an

approved location near the principal entrance to a refrigeration machinery room.



Table 11-1

Additional refrigerant data was inserted into Table 11-1. This data was reprint with the

permission from the American Society of Heating, Refrigerant, and Air-Conditioning

Engineering.

Analysis: Updated Table 11-1 to the current ASHRAE standard.

Section 1201.4.1.3

Insulation. Covering and insulation used for hot water pipes shall be of material suitable

for the operating temperature of the system. The insulation, jackets, and lap-seal

adhesives, including pipe coverings and linings, shall be tested as a composite product

installation and shall have a flame-spread index of not more than 25 and a smoke-

developed rating index of not more than 50 when tested in accordance with building code

standards NFPA 255-2000, Standard Method of Test of Surface Burning Characteristics of

Building Materials; in accordance with ASTM E 84-2000a, Standard Test Method for

Surface Burning Characteristics of Building Materials; or in accordance with the provisions

of UL 723-96, Standard for test of Surface Burning Characteristics of Building Materials.

Insulation coverings and linings shall not flame, glow, smolder, or smoke when tested in

accordance with ASTM C 411-97, Standard Test Method for Hot-Surface Performance of

High-Temperature Thermal Insulation, at the temperature to which they are exposed in

service. In no case shall the test temperature be below 250°F (121°C).

Analysis: These changes are consistent with proposals made to NFPA 90A and to the IMC, and with changes

to Section 602.2 and 605.0 in the UMC. This revision is a clarification for an existing requirement and to

address the references to ASTM E 84, ANSI/UL 723, ASTM C 411 and NFPA 255. The terminology adopted

by ASTM committee E5 on Fire Standards is now clear in that the terms recommended to be used are “flame

spread index” and “smoke developed index”.

Section 1201.5

Those portions of the hot water piping systems in which the continuous pressure

temperature relationship does not exceed the following shall be permitted to be constructed

of cross-linked polyethylene/aluminum/cross-linked polyethylene (PEX-AL-PEX) piping

conforming to specification ASTM F1281.

Additional PEX-AL-PEX requirements are mentioned within sub-sections of 1201.5. Refer

to 2003 UMC for detail of these requirements.

Analysis: Requirements for PEX-AL-PEX were inserted into Chapter 12. This material has been demonstrated

to be suitable for the application mentioned.

Chapter 13

All previous language has been deleted and replaced with new language, figures and

tables that have been extracted from Chapters 1, 5, 6, 7, 8, and 12 in NFPA 54, Appendix

B in the 2000 UMC, and sections in NFPA 501A.


Part I – Fuel Piping

1303.1 – Appliance Fuel Connector

1303.2 – Fuel Gas

1303.3 – Gas Piping

1304.0 – Inspection of gas piping

1305.0 – Certification of Inspection

1306.0 – Authority to Render Gas Service

1307.0 – Authority to Disconnect

1308.0 – Temporary Use of Gas

1309.0 – Gas Piping System Design, Materials, and Components

1309.3 – Interconnections Between Gas Piping Systems

1309.4 – Sizing of Gas Piping Systems

1309.5 – Acceptable Piping Materials and Joining Methods

1309.6 – Gas Meters

1309.7 – Gas Pressure Regulators

1310.0 – Venting of Gas Appliance Pressure Regulators

1311.0 – Gas Piping Installation

1311.2 – Installation of Piping

1311.3.1 – Concealed Piping in Building

1311.6 – Drips and Sediment Traps

1311.7 – Outlets Fittings and Piping

1311.9 – Manual Gas Shutoff Valves

1311.11 – Systems Containing Gas-Air Mixtures Outside the Flammable Range

1311.12 – Systems Containing Flammable Gas-Air Mixtures

1311.13 – Electrical Bonding and Grounding

1311.16 – Pipe Sizing Methods

1312.0 – Equipment Connections to Building Piping

1313.0 – LP-Gas Facilities and Piping

1314.0 – Pressure Testing and Inspection

Part II – Fuel Supply: Manufactured/Mobile Home Parks and Recreational Vehicle Parks

1320.0 – Single and Multiple Manufactured Homesite Fuel Supply Systems

1325.0 – Manufactured Home Community LP-Gas Supply Systems

1334.0 – Manufactured Home Accessory Building Fuel Supply Systems

1335.0 – Community Building Fuel Supply Systems in Manufactured Home Communities

1336.0 – Recreational Vehicle Park Fuel Gas Equipment and Installations



ease comparison of the two documents. These are three important areas that changed: Fuel gas piping

systems are limited to 5 psi, the specific prohibition against liquefied petroleum appliances in a pit or

basement was removed, and CSST fuel piping systems were added to the code.

Chapter 14

No change

Chapter 15

No change

Section 1601.0

Scope. Stationary fuel cell power plants shall be tested in accordance with ANSI Z21.83,

American National Standard/Canadian Gas Association Standard for Fuel Cell Power

Plants, and shall be installed in accordance with NFPA 853, Standard for the Installation of

Stationary Fuel Cell Power Plants and the manufacturer’s installation instructions.

Analysis: This is a new chapter, which references ANSI Z 21.83 (Standard for Fuel Cell Power Plants)

Chapter 17

Chapter 16 of the 2000 UMC has been moved to Chapter 17 in the 2003 UMC.

In Part I, only UMC Standards No. 2-2, 6-2, and 6-5 have been retained. The remaining

standards were deleted.

In Part II, the standards are listed by product category and promulgating agency.

Analysis: The format of the standards was completely redone by the Standards Task Group to be more user

friendly.

Appendix A, Standard No. 6-2

See Section 506.2, 602.1, and 602.5 of the Uniform Mechanical Code

Analysis: Two additional sections reference Standard No. 6-2 in the 2003 UMC.

Appendix B

All language from Appendix B, Chapter 15 has been deleted and replaced with extracted

language from NFPA 54, Chapter 11.




Appendix C

All language from Appendix C has been moved into the body of code in the 2003 version.

Chapter 16 in Appendix B of the 2000 UMC has been moved into Appendix C of the 2003

UMC.

Analysis: Reformatting of the 2003 UMC to be more user friendly.

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