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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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2
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
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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
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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.
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Type B Gas Vent - 3” to 12” DiameterInstallation
Instructions
5
(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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6
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
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Type B Gas Vent - 3” to 12” DiameterInstallation
Instructions
7
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
crichejeTypewritten Text
crichejeTypewritten Text
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8
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
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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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10
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 1.0Over 6/12 to 7/12 1.25Over 7/12 to 8/12 1.5Over
8/12 to 9/12 2.0Over 9/12 to 10/12 2.5Over 10/12 to 11/12 3.25Over
11/12 to 12/12 4.0Over 12/12 to 14/12 5.0Over 14.12 to 16/12
6.0Over 16/12 to 18/12 7.0Over 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
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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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12
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