Type B Gas Vent - 3” to 12” DiameterInstallation Instructions

1

Please read and understand the requirements before proceeding.

Hart & Cooley Type B gas vent pipe and fittings areUnderwriters Laboratories-tested and listed toStandard 441 for use with listed gas-fired appliancesthat have been certified for use with Type B gasvent. B-Vent is intended for neutral or negative draftapplications. It is designed for vertical installations(including laterals) but may be used for horizontalapplications with a draft-inducing fan located suchthat all indoor portions of the vent are under negativepressure.

The materials in this B-Vent have been selected toprovide maximum resistance to corrosion and heat;however, their use with temperatures exceeding550° F or in highly corrosive atmospheres, such aschlorinated hydrocarbons (i.e., refrigerants, dry-cleaning fluids, degreasers, paint removers, etc.),may substantially reduce their life expectancy.

These installation instructions will enable the in-staller to make a safe and proper installation of thevent. Compliance with these instructions will ensurean installation that mee ts the requirements of allNational Building Codes and the National Fuel GasCode, NFPA 54 and NFPA 211. Hart & Cooley TypeB gas vents are listed under the follow-up serviceof Underwriters Laboratories, Inc.

CAUTIONFlue gas temperatures must never exceed

550° F in any Hart & Cooley gas vent system.

Gas appliances that may be connected to TypeB gas vents

Type B gas vents may be used to vent gasappliances listed for use with Type B gas vent.

These vents shall be installed in accordance withour listing as detailed in these installationinstructions. The type of appliances that may bevented with these vents include:

Unit heaters Room (space) heatersDuct furnaces Central warm-air furnacesAttic furnaces Hot-water boilersFloor furnaces Steam boilersWater heaters

CAUTIONHart & Cooley Type B vents are not to be usedwith appliances burning solid or liquid fuels.

Gas appliances that must be connected tochimneys

The following appliances must be connected tochimneys.

• All incinerators in domestic applications

• All appliances that may be converted readily t othe use of solid or liquid fuels

• Combination gas/oil-burning appliances

• Unlisted appliances

General instructions

• The vent should always be sized for the sea-levelname plate input rating of appliances inaccordance with the procedures set forth in theGas Vent Capacity Tables, which appear in theGas vent chimney sizing & application guide

or in NFPA 54.

• Provide for adequate air supply for combustionair and draft-hood dilution air. Refer to NFPA 54or the application guide for recommendedarrangements and proper size of air supplyopenings.

• Use only parts and fittings listed in the catalog toensure an approved vent.

Installation InstructionsType B Gas Vent - 3" to 12" Diameter

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Type B Gas Vent - 3” to 12” DiameterInstallation Instructions

• Portions of g as vents that may pass throughaccessible spaces must be enclosed to preventpersonal contact with and possible damage to thevent. The enclosure also may have to meet fire-resistance rating provisions. See all local andnational codes that may apply.

• Unenclosed outside vents below the roofline areprohibited.

• No damper or other restriction is permitted in agas vent.

gure 1

• Single-wall connectors and stovepipes may beused with Hart & Cooley Type B vent with thefollowing considerations: The use of single-wallmaterials cause higher heat loss from the flueproducts, which in turn reduce the draft and maycause condensation to occur.

(A) Since the heat loss from single-wall pipeis double that from Hart & Cooley pipe, be sureto use the capacity table for single-wall connector.

(B) Observe the local requirements forclearance to combustibles for single-wall pipe.This distance is 6" to 9" in most areas.

(C) Do not run single-wall connectors throughunheated spaces, partitions, or in concealedareas.

Step-by-step installation procedure

Assembly of the vent

Firestop Support

The Firestop Support (FSP) serves as both a firestop as well as a support. Each support isdesigned to support up to 20 feet of vent pipewhen installed as follows:

1. It is recommended that the Vent Pipe be supportedat least every other floor. The distance betweenmust not, in any case, exceed 20 feet.

2. Frame in an opening providing properclearance to Type B Gas Vent. See Figure 1and Table 1.

Figure 1

Vent Size “A” Square

3RP

4RP

5RP

6RP

7RP

8RP

5-1/2 inches

6-1/2 inches

7-1/2 inches

8-1/2 inches

10-1/2 inches

11-1/2 inches

3. Secure Firestop Support (FSP) as shown inFigure 2. Install strapping (minimum 3/4”, 28-gauge) through all four slots in collar, and nail asshown or nail at all four slots as shown in Figure3 and Figure 4.

Table 1

Type B Gas Vent - 3” to 12” DiameterInstallation Instructions

3

Figure 2

Figure 3

NAIL STRAPPINGIN PLACE(FOUR PLACES)

NAIL THROUGHSLOTS(FOUR PLACES)

Figure 4

NAIL THROUGHSLOTS(FOUR PLACES)

4. Pass Type B Gas Vent through opening in Fire-stop Support (FSP).

5. Install Support Bracket as shown in Figure 1.Clamp bracket securely to pipe section, using thepair of bolts and nuts provided. Insert the includedscrews through the holes in the Support Bracketand into the pipe.

For installations with multiple supports, an adjusta-ble length section of Type B Gas Vent should beinstalled between each pair of locations where aFirestop Support is used. See Figure 5. This pro-vides relief for thermal expansion. The adjustablelength section should be positioned directly underthe Vent Pipe section that is being supported.

NOTE:When installed with the entire vent in avertical position as shown in Figure 5, thebot tom end of the adjustable length sec-tions should not be secured with the screwsprovided. This will al low movement tocompensate for expansion. See section titledAdjustable Length Sections on Page 4.

FIRESTOP SUPPORT

20 FEETMAXIMUM

20 FEETMAXIMUM

Figure 5

ADJUSTABLELENGTH SECTION

FIRESTOP SUPPORT

ADJUSTABLELENGTH SECTION

FIRESTOP SUPPORT

ADJUSTABLELENGTH SECTION

APPLIANCEDRAFTHOOD

4

Type B Gas Vent - 3” to 12” DiameterInstallation Instructions

Round Support Plates

The Round Support Plate (RSP) is designed for usewith 9- inch diameter and larger Type B Gas Vent.Each support is designed to support up to 30 feet ofVent Pipe when installed as follows.

1. It is recommended that the Vent Pipe be supportedat least every other floor. The distance betweensupports must not, in any case, exceed 30 feet.

2. The circular cutout in the Round Support Plate isdesigned to engage the recess in the female endof the Vent Pipe. See Figure 6.

Figure 6

3. Surround the Vent Pipe with the two identicalSupport Plate halves. See Figure 7. Engage theplate edges in the pipe recess as described inStep 2. Use two pair of bolts and nuts to hold theplate halves together. (Four predrilled tabs areprovided for this purpose.)

4. Mounting holes are provided around theperimeter of the Round Support Plate. Useappropriate fasteners to secure the Support Platehalves to the opening between floors. (RoundSupport Plates should be attached to the TOP ofthe opening only.)

Figure 7

RECESS

5. For installations with multiple supports, anAdjustable Length Section of Type B Gas Ventshould be installed be-tween each pair of locationswhere a support is used. See Figure 5. This allowsthe location of the pipe recess to be in theproper position at each opening where a supportis to be used. The Adjustable Length Section alsoprovides relief for liner thermal expansion. TheAdjustable Length Section should be positioneddirectly under the Vent Pipe Section that is beingsupported.

Adjustable Length SectionsAdjustable Length sections of Type B Gas Vent areavailable to allow for installation where fixed-lengthsections do not produce the desired dimensions.The Adjustable Length sections use a clampingmethod consisting of a screw and tabs to draw theouter wall tightly around the mating section Type BGas Vent.

Adjustable Length Sections may also be used tocompensate for linear thermal expansion betweentwo fixed points in the vent system. An exampleof this is shown in Figure 5. In these examples,the fastening devices are not used. This allows forexpansion between two fixed supports or betweena fixed support and the appliance. Note that thefastening means should be left loose only if the Ventand the Adjustable Length Sections are installedvertically. I f the Adjustable Length Sections areused in a position other than vertical, such asbetween offsets, the fastening means should beused.

Finally, when joining an Adjustable Length Sectionto another section of Type B Gas Vent, make surethat there is a minimum overlap of one inch.

Assembly of the vent

• Appliances to be vented should be placed asclose as possible to the point where the vent is torun vertically up through the building.

• Install the support assembly (RSA). A supportassembly is recommended for all installations forthe following reasons.

Type B Gas Vent - 3” to 12” DiameterInstallation Instructions

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(A)It allows installation of the vent system prior toinstallation of appliances.

(B)It allows disconnection of the appliance forservice at any time without disturbing ortemporarily supporting the vent.

(C)It provides the required firestop as well assupport.

(D)It is UL-listed.

Figure 8

Figure 8 shows theinstallation of anRSA supportassembly.

Figure 9

Figure 9 shows an RSA ventsupport installation in floor or ceilingjoists or rafters of a flat roof.

Figure 10

Figure 10 shows an RSA ventsupport using a wall bracket(by others)

The support assembly shall be inst alled in thefollowing manner. Frame an opening betweenstandard 2" joists, either on 16" or 32" centers,depending on vent dimension, with headers of thesame dimension lumber as the joists (Figure 9) oron the wall studs with 2x4’s as in Figure 10. Theopening must be square and level on the bottomside. Place the support plate up into the openingwith flanges tight against the underside o f theframing. Nail in place with two 8d nails on eachside through the holes provided.

Installation of vent pipe in the RSA support

• Place a supporting collar in the groove at thebottom end of any standard pipe just above thelocking ring. Tighten the screw so that the collaris firmly clamped into position in the groove. Thepipe is now assembled properly to fit into thesupport plate. (See Figure 11.) This pipeassembly will rest on the upper side of the supportplate and provide the REQUIRED 1-INCHCLEARANCE FROM COMBUSTIBLES. The pipewill protrude below the support for connectingadditional pipe from the vent to the appliance. Amaximum of 60 feet of vent can be installed abovethe support before resupport is required.

Figure 11

• Place an RDH draft hood connector on the outletor the draft hood of the appliance. The aluminumportion of the draft hood connector should befastened to the appliance collar with sheet metalscrews. The extending aluminum portion can bereadily shaped by hand to fit oval collars.

• Install vertical vent pipe and fittings.

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Type B Gas Vent - 3” to 12” DiameterInstallation Instructions

Installation for Optional Model RGS Firestop/Gripper Support

• At the desired location, cut a square or circularhole in the floor at a minimum of 2½ inches largerthan the nominal pipe size, but not greater than 4inches larger. See chart below. This will providethe required 1-INCH CLEARANCE FROM COM-BUSTIBLES.

Support Hole Dimensions(inches)

3

51/2

7

Nominal Pipe Size

Nominal Hole Size

Maximum Hole Size

3

51/2

7

3

51/2

7

3

51/2

7

Table 2

• Place the support over the hole with the ring down.

• Use an 8-penny nail or self-drilling sheet metalscrew in each corner at least 3/8 of an inch fromthe edge.

• Pipe should be inserted from below. A maximumof 30 feet of pipe may be installed above thesupport before resupport is required. (See Figure12.)

Figure 12

Assembling jointsSee Figures 13, 14, and 15• Use gloves when handling vent parts.

• To assemble joints of pipe and fittings, first makesure that the lock ring is moved upward sufficientlyto clear the formed tabs. Check the tabs to seethat they are projecting slightly outward from thepipe so that the upper section will slide down overthe top end of the lower section to which it is beingjoined. Look for the word “UP” with the arrowpointing in the direction of flue-gas flow.

• Slide the top pipe or fitting down over the upperend of the lower pipe until the projections on thetabs line up with the groove in the lower pipe.The joint will naturally come to a stop at this pointif it is placed firmly down over the lower section.

• Using the thumbs and fingers, press the tabs intoposition, and slide the lock ring down to lock thetabs in place.

• If for some reason it isnecessary to uncouplea joint, this may be eas-ily done by sliding upthe lock ring and mov-ing the top sectionslightly to loosen thetabs. The section canthen be lifted off.

(A) Whenever possible, a vertical vent should beused. This is done by simply using straight sec-tions of pipe from the dra ft hood connector outthrough the roof. Where this is not possible, avent connector using B-vent is used to run later-ally from the draft hood to the base

Figure 13

Figure 14 Figure 15

Type B Gas Vent - 3” to 12” DiameterInstallation Instructions

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of the vertical vent. The horizontal length ofthis vent connector should not exceed 1½ feetfor each inch of connector diameter. If it is nec-essary for B-vent connector to pass through apartition, an RWT thimble may be used, or thewall framed to allow 1-INCH CLEARANCE andan RPC collar used on each side of the parti-tion. When a vent connector is used, it shouldhave as much vertical rise as possible BEFOREthe horizontal run. Vent connectors attacheddirectly to side out-let draft hoods,shuch as floor fur-naces, shall bepitched upward atleast 1/4 inch perfoot. The lateralrun of vent connec-tors attached to topoutlet draft hoodsmay be either horizontal or pitched upward.

(B) The necessary straight lengths of pipe shouldbe connected to the elbow, tee, or the draft hoodconnector, and all joints should be securelylocked together as indicated above.

(C) Floors, ceilings, a nd other combustibleconstruction should be cut away or framed a snecessary to provide a MINIMUM OF 1-INCHCLEARANCE from the surface of the vent pipe.Metal straps should be used to maintain the ventpipe in position to ensure that the 1-INCHCLEARANCE to combustibles is maintainedafter the walls are closed. (See Figure 16.) DONOT SCREW INTO THE VENT.

CAUTION

Do not allow the offset pipe to put pressureon the elbow. Use pipe strap for support.

(D) Whenever possible, the vent should be contin-ued straight out through the roof. If it is neces-sary to make offsets in the attic space, the lat-eral run should be sloped upward as sharplyas possible, using elbows to minimize resis-tance. The lateral run should be supported

using metal straps, and again maintaining theMINIMUM CLEARANCE OF 1 INCH from com-bustibles. (See Figure 9.)

CAUTION

Laterals in common vents are limited to1½ feet for each inch of vent diameter.

(E) Laterals must be supported at 5-foot maximumintervals. Where vertical vents are spaced byfirestops between floors, they need only be sup-ported at the bottom.

Framing to prevent contact with buildinginsulation• In many instances, vents pass through ceilings

that are insulated. I n these cases, it isnecessary to frame around the opening cut inthe ceiling for passage of the vent pipe so thatbuilding insulation or other combustible materialwill not come in contact with the surface of thevent. This framing should, of course, bearranged to PROVIDE 1-INCH MINIMUMCLEARANCE from the surface of the vent.(See Figure 16).

• Occasionally Type B vent connectors must passthrough partitions that are insulated. Thesimplest means of preventing contact with theinsulation in these cases is to use an RWT wallthimble.

DO NOT USE SCREWSIN B-VENT UNLESSLINING A MASONRYCHIMNEY. SCREWS

ARE NOT NECESSARYAND CAUSE NOISE.

For

For Caps seeFigure 20 and Table 3

Figure 16

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Type B Gas Vent - 3” to 12” DiameterInstallation Instructions

Fire-stopping• In single-story, slab-floor houses having an attic

space, afirestop mustbe providedwhere the ventp a s s e sthrough theceiling, unlessa support isused there.The ceilingshould be cutaway from theopening frameto PROVIDE1-INCH MINIMUM CLEARANCE from the ventpipe. A firestop consisting of a noncombustiblematerial, such as 1/4-thick ceramic board or 26-gauge galvanized sheet metal, should be cut tofit the pipe and the framed opening. The firestopshould be fastened to the top of the joists andframing members to eliminate any pockets inwhich combustible debris might collet. An RPCpipe collar may be used on the underside of theceiling to finsh off the opening. (See Figure 17.)

• In single-story buildings with an attic space and with thegas appliance located in a basement or crawl sp ace,firestops must be provided where the vent passesthrough both the floor and the ceiling. This can bedone by cutting away and framing the floor and ceilingconstruction and installing firestops of noncombustiblematerial as shown in Figure 17). All combustibleconstruction should be cut away sufficiently to PROVIDETHE MINIMUM CLEARANCE OF 1 INCH FROM THEVENT PIPE SURFACE.

• In multi-story buildings, a firestop must be providedat every point where the vent p asses through afloor or ceiling. These firestops may be providedas indicated in the paragraph above.

• Four-inch round vent (4RPX) may be used in a 2” x 6”stud wall. The proper clearance in a 2” x 6” wall isprovided by the spacer on the pipe and by the 4RFSfirestop spacer. All other uses of a 4” pipe require thenormal 1-INCH CLEARANCE TO COMBUSTIBLES.

• Four-inch round vent (4RP) must maintain 1-INCH CLEARANCE T O COMBUSTIBLES.

Terminations using a flashing and a cap

Gas Venting Systems use a termination cap and may terminate in accordance with Table 3 andFigure 20. 3" - 8" TOP INSTALLATION Round tops (for pipe sizes 3"-8") have a spring clipwhich engages and locks automatically when thetop is pushed into the upper end of the pipe. (SeeFig. 22-A.) The top will also fit any single wall metalpipe having full nominal inch dimensions. (Neveruse single wall metal pipe where Type B Gas Ventis required). To attach securely, bend a one inchlength of the pipe upper end inward about 1/8". Thespring clip will lock under this bent edge. (See Fig-ure 22-B.) To remove the top from any pipe, pull upevenly on the opposite sides of the skirt of the top.

Figure 17

Figure 18

Type B Gas Vent - 3” to 12” DiameterInstallation Instructions

9

Models RHW and RM caps, sizes 3" through 12",are listed for installation on gas vents terminatingso that the lowest discharge opening shall be nocloser than the minimum height shown i n Table 3and Figure 20. These minimum heights may beused, provided that the vent is not less than 8 feetfrom any vertical wall. FOR A VENT CLOSER THAN8 FEET, THE VENT TERMINATION MUST BERAISED UNTIL 2 FEET HIGHER THAN THESTRUCTURE.

Offsets in the attic space should be used to minimizethe amount of vent pipe that must be exposed abovethe roof in order to comply with the above. No gasvent should be terminated less than 5 feet in verticalheight above the highest connected appliance drafthood outlet.

• If a vent extends more than 5 feet above the roof,it should be guyed with 3 wires or braced with2 pieces of rigid conduit

CAUTION

Where heavy snowfall occurs, the cap shouldbe installed to a height above the average

snow depth.

Figure 19

• A cap or chimney housing offers resistance to theentrance of rain, snow and debris, as well as birds,and will minimize the effect of wind on the vent.It will protect the vent from down drafts causedby wind.

However, no vent cap, cowl or top can overcome theadverse effect of a region of high static pressure aroundthe vent terminal nor the effect of an interior region of lowpressure.

- Reference: American Gas Association Research Bulletin 68

Regions of high static pressure around the ventterminal can be avoided by following the generalrule for the vent termination given previously. Lowor negative interior pressures in the building maybe caused by (1) failure to provide combustion air,(2) excessive use of exhaust fans, and (3) tightconstruction resulting in the lack of infiltration air.Vented clothes dryers and fireplaces also willremove large amounts of air from the interior,tending to produce a low interior pressure.

WHERE THE VENT PASSES THROUGH THEROOF, the roof sheathing should be cut awaysufficiently to PROVIDE A MINIMUM OF 1-INCHCLEARANCE from the vent pipe. The vent pipeshould be run up to a point where the top end is atleast a foot or so above the roof.

An RF roof flashing should be placed down overthe upper end of the pipe, and adjusted so the baseplace of the flashing fits tightly against the roof withthe vent pipe held in a position, MAINTAINING THE1-INCH CLEARANCE FROM COMBUSTIBLECONSTRUCTION. The flashing may be sealed tothe roof. The RS storm collar must be placedimmediately above the roof flashing. The stormcollar must be sealed with roof cement or RTVsilicone to seal the joint between the storm collarand the vent pipe. The storm collar providesprotection against the entrance of any moisture intothe flashing.(See Figure 16.)

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Type B Gas Vent - 3” to 12” DiameterInstallation Instructions

Painting the exposed vent surfaces above the roofwill result in longer vent life. A good grade of paintdesigned for use on galvanized steel should beused. RHW and RM caps push straight down andsnap onto the pipe. To remove, pull straight up androck slightly.

Roof Pitch

Minimum He ightfrom Roof to Low e s tDischarge Opening, Ft.

Flat 6/12 1.0

Over 6/12 to 7/12 1.25Over 7/12 to 8/12 1.5Over 8/12 to 9/12 2.0

Over 9/12 to 10/12 2.5Over 10/12 to 11/12 3.25Over 11/12 to 12/12 4.0

Over 12/12 to 14/12 5.0

Over 14.12 to 16/12 6.0

Over 16/12 to 18/12 7.0

Over 18/12 to 20/12 7.5Over 20/12 to 21/12 8.0

Table 3

Notice concerning limitation of Hart & Cooleypipe used with gas appliances

• Gas vent systems should be plainly andpermanently labeled: This gas vent is forappliances that burn gas only. Do not connect to

incinerators or solid or liquid fuel-burningappliances. Inspect the vent prior to each heating

season to confirm an unrestricted vent.

• The authority having jurisdiction shall determinewhether the particular locality constitutes an areawhere such notice must be posted.

• In those cases where the posting of such a noticeis required, a label shall be placed as follows.

(A) Where a vertical vent is used, the labelshall be placed on the ceiling near thepoint where the vent passes through theceiling.

(B) If the vent is horizontal, the label shallbe placed on the wall near the pointwhere the vent passes through the wall,on the side of the partition on which theappliance is located.

Outside vents

Occasionally it is necessary to vent an appliancethrough an exterior wall and up along the out sidewall to a point above the roof, as shown in Figure18.

In this case, an R DH draft hood connector and/orshort length of RP pipe is used to connect the ap-pliance to an RT tee, which is capped of f on thebottom and supported. T he vertical vent is thenerected from the tee, using straight lengths of RPpipe. These lengths of pipe should be securelylocked together and positioned with RWB wallbrackets to MAINTAIN 1-INCH MINIMUM CLEAR-ANCE TO COMBUSTIBLE CONSTRUCTION ATALL POINTS. The vent may be carried through theroof overhang using an RF flashing and RS stormcollar, and terminated with a cap. The vent thenshall be enclosed below the overhang.

Lining a masonry chimney

An unlined masonry chimney is not permitted to beused to vent gas appliances. Hart & Cooley TypeB gas vent or chimney liner system may be usedto line a masonry chimney. These instructions arefor Type B vent.

Lining an unused masonry chimney should be doneonly by a qualified contractor. Contact local buildingor fire officials about restrictions and inst allationinspection in your area.

Figure 20

Type B Gas Vent - 3” to 12” DiameterInstallation Instructions

11

The chimney liner size must not be less than thatspecified in the appliance manufacturer’s instructionsor smaller at any point than the connected applianceflue outlet size. Zero airspace clearance betweenthe vent and the chimney interior surface is permitted.The masonry chimney may also have a zero airspaceclearance (direct contact with) combustibles and thechimney exterior surface. This is permitted withnominal 4"-width brick. A masonry chimney musthave a clear passageway, sound construction, andbe clean before proceeding. Inspect the chimneyfor cracked brick and mortar, missing pieces or holes,and repair as necessary. To prevent corrosion to theB-vent, thoroughly clean the chimney of any residualdebris, creosote, or soot that may coat the insidepassageway. The passageway must be at least largeenough to accommodate the proper size B-vent forthe appliance(s).

If there is space remaining in the chimney outsidethe liner, this space shall not be used to vent anotherappliance unless another liner is used. Minimumand maximum heights and sizing for B-vent are inthe National Fuel Gas Code. The chimneytermination must meet the requirements of NFPA 211.

Installation• A tee (RT with a tee cap, RTC) should be used at

the lowest point of the liner. A welded angle ironframe (byo t h e r s )mortared intothe chimneywalls should beused with thes u p p o r tassembly. (SeeFigure 21.) Through-bolt the support assemblyinto the frame with 1/4-20 nuts and botls (byothers) in all holes. Place the supporting collar inthe groove at the bottom of the tee just above thelocking ring. (See Figure 8.) Tighten the screwso that the collar is firmly clamped into position inthe groove. The tee is ready to fit into the supportplate.

• Sixty feet of pipe may be supported by the RSAsupport. If more than 60 feet is required, anothersupport assembly may be used. An adjustablelength (RPA) should be used just below the

Figure 21

resupport to make up for odd dimensionsbetween supports and to provide for expansion,if necessary.

• If pipe assemblies are lowered into place fromabove, sheet metal screws should be used to holdthe lock bands in place.

• Terminate the vent with a tall cone flashing (RTF),storm collar (RS), and appropriate diameter cap.

Maintenance and inspectionGas is a clean-burning fuel that typically does notrequire maintenance of appliance vent system.However, the liner must be inspected at least oncea year by a qualified inspector or installer at thesame time that the appliance is being inspected andserviced. The cap snaps off for visual inspection ofthe outlet area. Connector pipe should be removedto examine the inlet at the base of the chimney.Look for loose joints, debris, condensate orcorrosion, and clean or repair as required.

Combined vents

• For detailed instructions for combining two or moreappliances into a common vent, see the Gas VentCapacity Tables section in the application guide.

• Whenever possible, vents should be run directlyfrom collar of the appliance vertically out throughthe roof in the most direct method available.

• In those cases where it is necessary or desirable tocombine the vent connectors of several gas-firedappliances into a common vent, the vent connectorfrom each individual appliance should be arrangedto have as great a vertical rise as possible beforestarting the lat-eral run to thecommon vent. Ifa combined ventcannot be usedbecause of limi-tations in theconnector rise ortotal vent height,alternatives such as those illustrated (Figure 22) maybe used to secure greater rise or greater total ventheight. TYPE B GAS VENT CONNECTOR mustbe used for Figure 22B.

Figure 22

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Type B Gas Vent - 3” to 12” DiameterInstallation Instructions

THESE INSTRUCTIONS SHOULDREMAIN AVAILABLE TO THE

HOMEOWNER AT ALL TIMES.

©2015 Hart & Cooley, Inc. All rights reserved Form No. 150952 12/15/2015 Printed in U.S.A.

Installation instructions for Hart & CooleyUL-listed Type B gas vent adapters

The following table specifies the UL-listed adaptersto be used when changing between Hart & Cooleyand B-vent manufactured by others.

OtherManufacturer

PipeDiameter

Other intoHart & Cooley

Hart & CooleyVent into

Selkirk LLC

Metal Fab, Inc.

American MetalProducts, Inc.

General ProductsCompany, Inc.SimpsonDura-Vent

3" - 6"7" - 8"3" - 6"7" - 8"3" - 6"7" - 8"

3" - 6"7" - 8"

3" - 6"7" - 8"

RA or RPSRA

RA or RPSRA

RA or RPSRA

RAARAA

RAARAA

RAA

RAA

RAA

RAA

RAA

Other into Hart & Cooley vent

Assemblethe femaleend of thea d a p t e rover themale endof the other listed B-Vent. Fully seat the adapter orprovide a minimum of 1-inch overlap. Tighten thescrew in the slips provided. (See Figure 23.)

Hart & Cooley vent into Other

Insert “Other” female end’sinner and outer inside RRA’sinner and oute r. Slidetogether minimum of 1 inchto seat inner. Tighten thescrew. (See Figure 24.)

Figure 23

Figure 24

Table 4