DuraVent BV User manual

BV
L205 464002189 REV.01 04/2022
TYPE B GAS VENT
MODEL
Installation Instructions
Round and Oval Type B GasVent
Systems for use with natural gas or
liquid propane category I and draft hood
equipped appliances and appliances
listed to use Type B Gas Vent.
• Scan Code For French and Spanish Instructions
• Scannez le code pour les instructions en français et espagnol
• Código de escaneo para francés e instrucciones en español

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A MAJOR CAUSE OF VENT RELATED FIRES IS FAILURE
TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES) TO
COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST IMPORTANCE
THAT TYPE B GAS VENT BE INSTALLED ONLY IN ACCORDANCE
WITH THESE INSTRUCTIONS.
IMPORTANT:
Read through all of these instructions
before beginning your installation. Failure
to install this product as described in these
instructions will void the manufacturer’s
warranty, may create a re or other safety
hazard, and may a󰀨ect your homeowner’s
insurance and safety listing of your
appliance.
Keep these instructions for
future reference.
Dear Customer, Installer, or End User:
We welcome any comments regarding
matterspertainingtoourDuraVent products.
We welcome any ideas, input or
complaints and somebody will respond
directly back to you.
Send your emails to:
[email protected]
If you are searching for tech support or
product information, please call us at
800-835-4429.
Or email us at:
[email protected]
LISTED
MH2848 AND MH17667

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CONTENTS
Certication Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SECTION 1 (Small Diameter Model BV - 3” to 8”) . . . . . . . . . . . . . . . . . . . 5 - 18
Vent Designations/Types of Appliances and Buildings, Joint Method. 5 - 6
Air Supply, Vent Clearances, Location and Enclosures . . . . . . . . . . . .6 - 7
Vent Connector Type and Size, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 - 8
Firestopping, Attic Insulation Shield, Wall Support / Wall Band . . . . . . .8 - 9
Gas Vent Fittings, Fixed Wye . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 10
Male and Female Universal Adapters, Gas Vent Height . . .. . . . . . . .10 - 11
Supports - Primary, O󰀨set, Quick Grip . . . . . . . . . . . . . . . . . . . . . . . . 12 - 13
Flashings, Vent Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 - 14
DuraCap Installation, Vent Operation, Painting . . . . . . . . . . . . . . . . .14 - 15
DuraConnect II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 - 18
DuraConnect I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 - 20
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
SECTION 2 (Large Diameter Model BV - 10” to 30”) . .. . . . . . . . . . . . . . .20 - 25
Ilustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .20
Draft Hood Connectors, Firestop Support Plate, Joint Method . . .21 - 22
Adjustable Length, Gas Vent Fittings . . . . . . . . . . . . . . . . . . . . . . . .23
O󰀨set Table, Increasers, Tees, Termination Caps . . . . . . . . . . . . . . . . . . .24
Termination of Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 - 25
Vent Operation, Painting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
SECTION 3 (Model BVO Oval - 4”, 5”, 6”). . . . . . . . . . . . . . . . . . . . . . . .26 - 28
4, 5 , 6-Inch Oval Installation in 2x4 Inch Stud Walls. . . . . . . . . . . . 26 - 27
4-Inch Oval Installation as B-W Gas Vent . . . . . . . . . . . . . .. . . . . . . . . . . 27
4-Inch Oval Installation as B-W in Multi-Story. . . . . . . . . . . . . . .. . . . .27
Attic Shield, Joint Method - Lock and Unlock . . . . . . . . . . . . . . . . . . . . . . .28
TYPE B GAS VENT
TYPE B GAS VENT INSTALLATION
INSTRUCTIONS

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CERTIFICATION LABELS

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Type B Gas Vent
for Category II, III
or IV gas appli-
ances, or for any
gas appliance
which requires
either a pres-
sure-tight or liq-
uid-tight venting
system.
All sizes of Model BV Type B Gas Vent may
be used in single and multistory buildings. All
Model BV Type B Gas Vents may be used for
both individual and multiple appliance venting.
Model BV Type B Gas Vents are to be installed
and used in accordance with the “National
Fuel Gas Code”, NFPA 54, the “Standard for
Chimneys, Fireplace and Venting Systems”,
NFPA 211, the “International Fuel Gas Code”.
In Canada, Model BV Type B Gas Vents are
to be installed and used in accordance with
the “Canadian Fuel Gas Installation Code”,
CSA-B149.1-00, and/or applicable local/
regional codes. Model BV Type B Gas Vent
is also suitable for use in existing, otherwised
unused and new masonry chimneys to protect
the chimney from damaging e󰀨ects of moist
combustion products from the appliances listed
above. NEVER USE Model BV Type B Gas
Vent on any appliance that is not listed and
approved for venting with Type B Gas Vent.
Model BV Type B Gas Vent is designed for
venting listed Natural Gas or Liquid Propane
Category I gas appliances equipped with draft
hoods and other listed gas appliances spec-
ied for use with Type B gas vent producing
ue gas temperatures not in excess of 470°F
(245°C). These appliances include (but are
not limited to) the following types: furnaces,
boilers, water heaters, room heaters, unit
heaters, duct furnaces, oor furnaces, and
decorative appliances.
DO NOT USE Model BV Type B Gas Vent for
wall furnaces “Listed” for use with Type BW
Gas Vents only, incinerators and appliances
Listed for use with chimneys only, combination
gas-oil burning appliances, and appliances
which may be converted readily to the use of
solid or liquid fuels. DO NOT USE Model BV
3. GAS VENT JOINT METHOD
All joints of Model BV Type B Gas Vent
must be secured using the “DuraLock”
feature. To use the DuraLock feature, ori-
ent sections as shown in Fig.1 and push
adjacent pieces together until fully engaged.
NOTE: Some local jurisdictions require a sup-
plemental screw(s) at joints to prevent disen-
gagement of the joint. Although not required
under the terms of the UL Listing because of
the integral couplers, screws are permitted to
be installed at the joints in 3” through 8” vent.
In such case, the screws should be located
aproximately 1/4” from overlapped edge and
must be maximum 1/4” in length so they do not
pierce or deform the inner liner.
The DuraTab® feature provides the equivalent
of using a screw. Once engaged (with nger or
Failure to follow the installation
instructions could cause FIRE,
CARBON MONOXIDE POISONING, OR
DEATH. If you are unsure of installation
requirements, call the Phone Number
listed on the instructions, 1-800-835-4429
or visit www.duravent.com.
WARNING
1. GAS VENT DESIGNATIONS/
TYPES OF APPLIANCES
DuraVent Model BV Type B Gas
Vent parts LISTED and produced under the
Factory Inspection and Follow-up program
of Underwriters’ Laboratories, Inc. carry the
LISTING MARK illustrated here. Type B Gas
Vent has been tested, and listed using all of
the supports, restop, etc., described herein.
Deletion or modication of any of the required
parts or materials may seriously impair the
safety of your installation, and void the certi-
cation and or warranty of this vent. It is of the
utmost importance that this vent be installed
only in accordance with these instructions.
Model BV Round is listed to UL 441 and CAN/
ULC-S605 in diameters of 3” to 30”. Model
BVO Oval is listed to UL 441 in diameters of
4” to 6”. Model BVO Oval is not available in
Canada.
CAUTION: WEAR GLOVES WHILE
HANDLING METAL PARTS TO AVOID
PERSONAL INJURY. SHARP EDGES OR
PROJECTIONS CAN CUT YOU.
2. TYPES OF APPLIANCES AND BUILDINGS
SECTION 1
FIG. 1 - 3” to 8” BV

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U.S.A.: DuraVent Model BV Type B Gas
Vents 3 through 30 inch sizes must be
installed with the required MINIMUM AIR
SPACE CLEARANCE TO COMBUSTIBLES
as stated below!
Canada: DuraVent Model BV Type B Gas
Vents must be installed with the required
MINIMUM AIR SPACE CLEARANCE TO
COMBUSTIBLES as stated below!
These clearances are marked on all gas
carrying items. They apply to indoor or
outdoor vents whether they are horizontal or
vertical, or pass through oors, walls, roofs
or framed spaces. The appropriate clearance
should be observed to joists, studs, suboors,
plywood, drywall, or plaster enclosures,
insulating sheathing, rafters, roong, and
any other materials classed as combustible.
KEEP ELECTRICAL WIRES AND BUILDING
INSULATION AWAY FROM GAS VENT AND
OUT OF THE REQUIRED AIR SPACE!
Single wall materials used as vent connectors
are not permitted to be enclosed. There
is no need to enclose Model BV Gas Vent
where used as connectors under floors,
in crawl spaces and basements, or in
normally unoccupied or in inaccessible attics.
Enclosing the vertical portions of vents is
required where they pass through rooms,
halls or other occupied spaces.
NOTE: See pages 20-25 (Section 2) of these
instructions for additional information on the
installation of Large Diameter Model BV Type
B Gas Vents for diameters of 10” to 30”.
Maintain the required minimum air space
clearance to combustibles, wires, and
insulation:
1” - for 3” thru 30” installed in the U.S.A.
1” - for 3” thru 24” installed in CANADA
2” - 26” thru 30” installed in CANADA
4. AIR SUPPLY
Refer to the appliance installation instructions
and consult local building codes and/or NFPA
54 “National Fuel Gas Code” or the Canadian
Gas Installation Code CSA-B149.1.00 to
ensure compliance with required volume of
combustion air for each appliance installed.
5. VENT CLEARANCES, LOCATION AND
ENCLOSURES
DuraVent Type B Gas Vents are recommended
to be installed within the heated portion of the
structure wherever possible to reduce heat
loss which may in turn lead to poor draft and/
or condensation or/and ice problems.
thumb until it bends into the groove in the top/
outlet end of the adjacent piece), it prevents
the pipes from being disengaged unless the
tab is pried back out and dimples aligned.
NOTE: FOR JOINT METHOD ON LARGE
MODEL BV, SEE PAGE 22, SECTION 2 IN
THESE INSTRUCTIONS.
Attic Insulation
Shield
25mm (1”)
Clearance to
Combustibles
Enclosure
Support Plate
Gas Vent
Length
Draft Hood
Connector
Refer to the Fuel Gas
Codes NFPA 54 and
CSA-B149.1 for gas and
propane appliances and
the appliance’s installation
instructions for minimum
extension through the oor to
maintain connector clearance.
FIG. 2 - Typical Installation of Model BV (3” to 8”)
DuraCap
Cap
Storm
Collar
Flashing
45°/60° Elbows
Keep electrical wires and
building insulation away
from gas vent and out of
the required air space

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Type B Gas Vent
Storm Collar
Adjustable Flashing
Use an Attic Insulation
Shield in the attic
space or
enclosedthe vent
completely. Maintain
the required minimum
airspace clearance
to enclosure, wires and
building insulation.
Attic
Insulation
Shield
Tee
Wall
Support/
Band
R12 Min.
Insulation
Firestop
Spacer or
Wall Thimble
Fixed
Length
Wall
FIG.3 - Exterior
Enclosed Type B Gas
Vent
Storm Collar
DuraCap
Cap
Adjustable
Flashing
Attic
Insulation
Shield
(Attic)
FIG. 4 -
Typical Ceiling
and Roof
Penetrations
Vent
Tee Cap Adjustable
Length
Appliances served by an exterior gas vent
must have an air supply to the appliance
room adequate to balance indoor and outdoor
pressures. Otherwise, “stack action” of the
heated building can cause reverse venting
action when the appliance is o󰀨, or operating
on its pilot.
In multi-family residential, high rise and many
other types of buildings, codes specify that
vents must be located in re-rated shafts or
chases. Building code requirements in such
cases must be carefully followed with respect
to wall construction, access, clearance,
support, initial penetration of breaching, and
method of termination.
25mm (1”)
Clearance to
Combustible
Material
If an exterior location is necessary, an exterior
located Gas Vent (as per Figure 3) must be:
- Enclosed by a chase spaced out 1” from
the vent at least to the roof line.
- The enclosure should be caulked to prevent
entry of moisture.
- It is also recmommended that his chase be
insulated to a minimum of R-12 (RSI 2.1).
- Rigid type insulation is recommended. If
a non rigid type is use, it must be restrained
in such a manner so that the required
minimum air space clearance to combustible
is respected.
- The bottom of the enclosure must be closed
o󰀨.
- It is recommended to provide an access
panel for future inspection and cleaning of
the vent.
6. VENT CONNECTOR TYPE AND SIZE
Model BV Type B Gas Vent meets all building
codes and safety standards for use as gas
appliance vent connectors. Correct selec-
tion of connector and vent size is detailed
in the “National Fuel Gas Code” (NFPA 54)
and the Canadian Gas Installation Code
CSA-B149.1-00, and/or local/regional codes.
Draft Hood connectors must be attached to
the appliance outlet with screws. Single wall
connectors, if used must be secured to the
appliance, to the gas vent, and at all joints with
3 sheet metal screws per joint. Attachment
of vent to non-metallic outlets should be per
appliance manufacturer recommendations.
NOTE: See the Large Diameter Model BV in
Section 2 for the requirement of Draft Hood
Connectors.

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FIG. 5 - Combined vent system using type B Parts
starting with Draft Hood Connectors.
Common Vent
Tee
Increaser
45°/60°
Elbow
Draft
Hood
Connector
Draft Hood
Connector
Increaser
90° Elbow
Adjustable
Length
Type B
Vent
45°/60°
Elbow
8. ATTIC INSULATION SHIELD
For diameters 3” to 8”, install an Attic Insu-
lation Shield where the vent passes into an
attic space. It is designed to keep insulation
materials or debris from coming into contact
with the vent (see Figures 2, 3 & 4). It must
accomodate the amount of insulation as re-
quired by the National Building Code.
Where height restrictions will not permit the
use of the Attic Insulation Shield, it is per-
missible to construct an enclosure with a 1”
air space clearance to the outer pipe all the
way to the underside of the roof deck. In this
application you would install a Firestop Spacer
on the ceiling side.
For a proper installation, the opening must
be fully framed at 1” of clearance to the outer
wall of the pipe with framing material of the
same dimension as the ceiling or oor joist.
Install the AIS from above and secure base
with nails or wood screws.
Seal the vapour barrier to the restop or
ceiling support assembly using a high tem-
perature silicone as per the requirement of
local authorities.
NOTE: For larger diameters (10” to 30”) a
Firestop Support Plate must be used installed
in a fully framed opening at the required air
space clearances to combustible materials.
7. FIRE STOPPING
All Type B Gas Vents passing through oors,
ceilings or walls must be restopped using the
Firestop Spacer. The Firestop must close the
area between the outer wall of the pipe and
the opening in the structure. In areas such
as attics with no oor, the Firestop should be
placed on top of a properly framed opening.
KEEP WIRES AND INSULATION OUT OF
REQUIRED AIR SPACE AROUND GAS
VENT. When venting is supported with the
Support Plate it may serve as a Firestop. See
Section 12. For gas vents within a shaft or
chase, restopping is provided by the vertical
walls of the shaft. Any openings in the chase/
shaft below the roof must be restopped.
Firestop placed
on top of oor or
framed opening.
Firestop
Spacer/Support
Plate
Firestop
Spacer
nailed in
place
Maintain minimum
airspace clearance
to combustibles,
wires and insulation
Firestop Spacer/Support
Plate to be framed on all
4 sides
FIG. 6 - Fire Stopping Required for all Ceiling/
Floor Levels
9. WALL SUPPORT/WALL BAND - FIGS
7&8
The Wall Support/Band is for use in supporting
35 ft. of vertical Model BV (3” to 8”) and estab-
lishes the proper 1” clearance to wall to which
it is attached, used at maximum 8 ft. spacing.
May also be used to provide lateral support.
1/4” #20x1-1/4”
Screw Nut
FIG. 7 - Wall
Support/Band
#10x1-1/4” Wood Screw
(4plcs - to Wall)
#8x1/4po Slotted
Hex Head Screw
at 3 holes if used
as a Support
Type B
Vent

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9
When installed as a Wall Support, the band
must be secured to the vent with the supplied
1/4” hex head screws. To do so, rst install the
assembly as indicated above for a Wall Band.
With a 1/16” drill bit, carefully drill holes through
the ouside of the vent section (ONLY), using
the holes in the band as a guide. Complete
the assembly by inserting the #8x1/4” hex
head screws through the holes (2 screws for
3” through 6”, 3 screws for 7” and 8” diameter
vent) and tighten.
NOTE: WHEN DRILLING OUTER WALL OF
VENT BE CAREFUL TO DRILL THROUGH
THE OUTER WALL ONLY, NOT THE INNER
WALL.
NOTE: REMEMBER TO MAINTAIN THE
REQUIRED MINIMUM AIR SPACE CLEAR-
ANCE TO COMBUSTIBLES FROM THE
OUTSIDE OF THE VENT.
CAUTION: WEAR GLOVES WHILE HAN-
DLINGMETALPARTSTOAVOIDPERSONAL
INJURY, SHARP EDGES OR PROJECTIONS
CAN CUT YOU.
When installed as a Wall Band, slip a vent
section through the band and clamp loosely
in place using the bolt and nut provided. Mark
the locations for the screws which will attach
the assembly to the wall. Secure the assembly
using four #10 wood screws provided. Secure
(clamp) the band around the vent by tightening
the screw and nut.
90°
Elbow
Type B
Vent
10. USE OF GAS VENT FITTINGS
Do not cut gas vent pipe or ttings. Adjustable
Lengths are telescoped over xed lengths, to
accommodate odd distances between vent
lengths or connectors. An Adjustable Length
suspended below a support serves as an
expansion joint between two xed points of
properly supported gas vent. Ordinarily, the
Adjustable Length must be secured, but for
expansion joints it should just maintain good
contact and a minimum 1-1/2” overlap. DO
NOT USE Adjustable Lengths to suspend any
weight of pipe below.
Elbows are fully adjustable. Tees used to
start vertical vents must use a Tee Cap to
prevent air leakage. All unused openings in
a gas vent must be sealed to prevent loss of
e󰀨ective vent draft.
Adjustable Length
Draft Hood
Connector
Firestop
Spacer
or Wall
Thimble
Wall
Support/
Band
Tee
Tee
Cap
FIG. 8 - Interior Wall Penetration for Type B Vent
CLEARANCE TO
BODY BRANCH COMBUSTIBLES
4” 3” 1”
4” 4” 1”
5” 3” 1”
5” 4” 1”
6” 3” 1”
6” 4” 1”
6” 5” 1”
On many newer gas appliances designed with
e󰀩ciencies of 78% to 83% (mid-e󰀩ciency
appliances, commonly referred to as fan
assisted appliances), it is important that the
connector system maintain the maximum
amount of heat as possible, in order to reduce
the chances of excessive condensation in the
venting system
Therefore, according to the current vent
sizing guidelines in many situations it will
be necessary to use Type B vent as the
connector system. As a convenience for use
in such installations, a xed wye tting is
available for maximum installation exibility.
The common vent extends from the ceiling
and the wye is attached in the manner as a
Tee. The body of the wye, can be rotated 360
degrees to accommodate the position of the
water heater or smaller appliance.
The lower section is connected to the main
FIXED WYE - SIZES AVAILABLE

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FIG. 9 - Fixed Wye
Draft Hood
Connector
Draft
Hood
Connector
Adjustable
Length
Type B
Vent
45/60
Elbow
Common Vent
Fixed Wye
Type B Vent
45/60
Elbow
45/60
Elbow
appliance, or the larger of the two appliances.
This section can be rotated 360 degrees
with respect to the main body and branch of
the wye is at a 45 degree angle. If two fan
assisted appliances are used, Type B vent
should be used on both connector systems.
If only one fan assisted appliance is used,
and sizing guidelines permit a single wall
connector pipe may be attached to Model BV
Fixed Wye tting with a Draft Hood Connector
and by inserting the crimped end of the single
wall connector into the Draft hood Connector
and attaching with three sheet metal screws
through the single wall pipe. Note: To
avoid excessive condensation, single wall
connectors should be used only in situations
where sizing recommendations permits.
When the wye fitting is attached to the
appliance with Type B vent, the final
connection can be made with either of two
adjustable lengths to eliminate the need for
special placement of either appliance.
Adjustable lengths are available in 12” and
18”.
VENT CONNECTOR TYPE AND SIZING
DuraVent Type B Gas Vent pipe meets all
building code and safety standards for use as
gas appliance vent connector and breechings.
Correct selection of connector and vent size
is detailed in the “National Fuel Gas Code”,
NFPA 54 in the US or the “Canadian Fuel Gas
Installation Code”, CSA-B149.1-00 in Canada
for Connector and Vent Capacities and sizing
recommendations.
MALE AND FEMALE UNIVERSAL
ADAPTERS
Male and female Universal Adapters are
available in 3” through 8” ID sizes. Universal
male adapters may be used to adapt to the
top (outlet) end of a compatible round, Type
B gas vent section, in order to continue the
system toward the termination with Model BV
joint coupling design.
Universal female adapters may be used to
adapt to the bottom (inlet) end of a compatible
Type B gas vent in order to continue the
system toward the appliance using DuraVent
round gas vent. The bottom end of the
adapter incorporates the Model BV joint
coupling design.
Compatibility
These fittings have been specifically
evaluated and listed for use in adapting to
other manufacturers of round Type B gas
vents.
The following Type B gas vent products are
directly compatible with DuraVent 3” through
8” Type B gas vent and require no adapters.
Selkirk(current and former)
Household Mfg. HVAC
Eljer HVAC
AirMate
Hart & Cooley
MALE ADAPTER - INSTALLATION
The male adapter is a tting designed to
slide (telescope) down over the top end of
the adjacent gas vent section with the inner,
aluminum liner sliding inside the existing liner
and the outer wall sliding outside (over) the
outer wall (see Fig. 10A).
Longer (12” and 18”) versions of the universal
male adapter are offered as “Adjustable
Lengths” for use either (1) in adapting to
another manufacturer’s gas vent or (2) in
conjunction with another length section to
develop an assembly of a specic dimension.
TO INSTALL - Slide the adapter over the top
(outlet) end of the adjacent gas vent being
sure the aluminum inner wall slides within
and the outer slides over the top. Push the
adapter down until it overlaps at least 1-1/2”.

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11
UNIVERSAL
MALE
ADAPTER
EXISTING
B VENT
SECTION
EXISTING
B VENT
SECTION
UNIVERSAL
FEMALE
ADAPTER
FIG. 10A FIG. 10B
FIG. 10 - MALE AND FEMALE UNIVERSAL
ADAPTERS
Using the holes in the outer wall of the
adapter as a guide, drill two holes through
in the outer wall (only) of the gas vent. Be
careful not to penetrate the inner liner of the
gas vent. Secure the adapter to the gas vent
section with two 1/4” maximum length sheet
metal screws (provided).
The top (outlet) end of the system has now
been converted to the DuraVent Model BV
joint coupling design.
FEMALE ADAPTER - INSTALLATION
The female adapter is a tting with a top end
designed to slide over the outer wall of the
bottom (inlet) end of the adjacent gas vent
section (see Fig. 10B).
TO INSTALL - Guide the top end of the
adapter over the bottom (inlet) end of
the adjacent gas vent being sure that the
aluminum inner wall of the existing vent
section slides inside the inner liner of the
adapter and the outer wall of the adapter
slides up and around the inlet end of the
adjacent gas vent piece. Push the adapter
up until it overlaps at least 1-1/2”. Securely
tighten the nut and bolt using a screwdriver
and/or pliers. The bottom (inlet) end of the
system has now been converted to the
DuraVent Model BV joint coupling system.
11. MINIMUM GAS VENT HEIGHT
A minimum gas vent height of 5 feet above the
appliance draft hood is required (see Fig. 11).
Where the vent has an offset, or serves
multiple appliances, greater heights may be
required for proper venting.
Special care must be taken with short gas
vents on duct furnaces, unit heaters, and
furnaces in attics to enssure they have
su󰀩cient vent height. Refer to the appliance
manufacturer instructions and local codes for
required minimum heights.
FIG. 11 - MINIMUM VERTICAL HEIGHT

12
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
3
5
5.5
7.5
7
9
6.5
8.5
8
10
4
6
Nominal Pipe
Size (inches)
Min. Hole
Size (inches)
Max. Hole
Size (inches)
QUICK GRIP - FIRESTOP/SUPPORT
1. At the desired location, cut a square
or circular hole in the oor at a minimum
of 2-1/2 inches larger than the nominal ie
size, but not greater than 4 inches larger.
See the table below. This will provide the
REQUIRED 1-INCH CLEARANCE FROM
COMBUSTIBLES.
2 Place the support over the hole with the
gripping ngers up (see Fig. 13).
3. Use an 8 penny nail or self-drilling sheet
metal screw in each corner at least 3/8 of an
inch in from the edge.
4. Pipe should be inserted from below. A
maximum of 30 feet of pipe may be installed
above the suport before resupport is required.
FIG. 13 - “Quick Grip” Firestop/Support
Clamping
Band
FIG. 12 - Firestop/Support Plate Assembly
Insert the rst length from above through
the clamp band and opening of the support
plate to proper elevation. Secure clamping
band to the length with tabs and 1/4” screws
(provided) so weight of vent rests on plate.
Room should be left for the draft hood
connector and adjustable length.
Vertical runs re stopped at 8 to 10 foot
intervals need only be supported near the
bottom. Additional Gas Vent Lengths above
the Support are simply stacked on. See
joining section to secure lengths together.
12. SUPPORT - PRIMARY AND OFFSETS
- 3” TO 8”
Gas vent piping must be securely supported.
Lateral runs are to be supported at least every
5 feet. The Support Plate has been tested
to support a maximum of 35’ of Gas Vent;
if additional height is required, use another
Support Plate on another oor level. It is
permissible to use the clamping band with a
generic 26 gauge or heavier plate (if space
requirements dictate).
Cut away and frame a four sided opening in
the oor from which the Gas Vent shall be
supported, to provide 1” (25mm) minimum
clearance to combustibles. See Fig. 12.
Nail Support Plate securely to joist and
framing members using 4 x 1-1/2” long nails
(1 nail at each corner).
Support Plate
may be trimmed or
replaced with custom size,
generic plate if
necessary, as long as
the required clearances
are respected
Tees used as vent inlets may be supported
by sheet metal plates or brackets. Plumbers
tape may be used to support both horizontal
and vertical piping. Short vents with less than
6 feet of vertical pipe below the ashing may
be suspended from the ashing. (The pipe
may be supported by the storm collar resting
on the top of the ashing). Use 1/4 inch
long sheet metal screws to attach the storm
Gripping
ngers
facing
upward

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
13
Apply a Non-
Hardening
Silicone Sealant
Bottom of
Flashing over
Roong
Maintain
minimum
25mm (1”) clearance
to combustible and
BV Type B Gas Vent
FIG. 14
Tall Cone Flashing For
Flat Roofs Only
Storm Collar
Top and Sides
of Flashing
under Roong
Flashing
FIG. 15 - Flashing Installation
13. FLASHING
The roof opening should be located and
sized such that the vent is vertical and has
the required air space clearance. The Tall
Cone Flashing is for at roofs only (see Fig.
14). It is nailed in place through all four
sides of the base ange. The Adjustable
Roof Flashing (see Fig. 15) is positioned
with the lower portion of the base ange over
roong material and the upper portion of the
base ange under the roong material. Nail
through only the upper portion and sides of
the base ange. (DO NOT nail through lower
ange.) Use nails with a neoprene washer, or
cover the nail heads with a silicone sealant.
Finish roong around the ashing, covering
the sides and upper areas of the ange with
roong material. A non-hardening sealant
may be used around the edges of the ashing
base where it meets the roof.
14. VENT TERMINATION
Gas vent piping must extend through
the flashing to a height above the roof
determined by Rule 1 or Rule 2 shown below.
A storm collar is installed on the vent pipe
over the opening between pipe and ashing.
A non-hardening silicone sealant is used over
the joint between pipe and storm collar. The
top is securely attached to the gas vent as
per section 15.
Rule I: For Pipes 12” and Under
The top is suitable for installation on listed
gas vents terminating a su󰀩cient distance
from the roof so that no discharge opening
is less than 2 feet horizontally from the roof
surface, and the lowest discharge opening
will be no closer than the minimum height
specified in Fig. 16-B. These minimum
heights may be used provided that the vent
is not less than 8 feet from any vertical wall.
collar to the pipe at the appropriate place.
Apply silicone sealant over the sheet metal
screw head. Gas vents supported only by
the ashing must be guyed above the roof
to withstand snow and wind loads. All gas
vents extending above the roof more than 5
feet must be securely guyed or braced.
When offsets are necessary, adequate
support above and below the offset is
required. In addition, securing the offset
elbow with three maximum 1/4” long sheet
metal screws is recommended.
Rule II - Tops for gas vent sizes 14” and larger
or less than 8’ from vertical wall.
For installations other than covered by the
Table 1 (Fig. 16-B), or closer than 8 feet
to any vertical wall, the DuraCap shall be
not less than 2 feet above the highest point
where the vent passes through the roof and
at least 2 feet higher than any portion of a
building within 10 feet. DuraCap 14” and
larger must comply with Rule II regardless
of roof pitch.
These rules were established on the basis
of tests conducted in accordance with
American National Standard ANSI/UL 441
and ULC-S605.
FIG. 16A - Roof Pitch 7/12 or Less
Non-Hardening
Silicone Sealant
Flashing
Storm Collar
DuraCap
Cap
12” Minimum
distance
to roof

14
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
1.0
1.5
2.0
2.5
3.25
4.0
5.0
6.0
7.0
7.5
8.0
17. PAINTING
Exterior above the roof line portions of the
vent may be painted with high temperature
paint to prolong the life and appearance
of the venting (and other components) of
DuraVent Type B Gas Vents. Use proper
painting procedure at time of installation.
16. CHECKING VENT OPERATION
Complete all gas piping, electrical, and vent
connections. After adjusting the appliance
and lighting the main burner, allow a couple
of minutes for warm-up. Hold a lighted match
just under the rim of the draft hood relief
opening (see Fig. 18). Proper venting will
draw the ame toward or into the draft hood.
Improper venting, indicated by escape or
spillage of burned gas, will cause match to
icker or go out.
For fan assisted appliances, which have
no draft hood, no such check is available.
However, fan assisted appliances are
designed to shut down if excessive pressure
is detected at the outlet. If this occurs it may
be an indication that the system is not venting
properly.
FIG. 18 - Match Test for Spillage
15. MODEL BV DURACAP INSTALLATION
Model BV Type B Gas Vent DuraCap and
Highwind Cap must be secured using the
“DuraLock” feature. To use the DuraLock
feature, orient sections as shown in Fig.1
and force the DuraCap to the upper end of
the pipe until joint is fully/properly engaged.
Engage the DuraTab® (with nger or thumb
until it bends into the groove in the top/ outlet
end of the of the pipe), it prevents the pipes
from being disengaged.
To remove the top from the pipe, pry back
out (with the end of a screwdriver) align the
dimples and pull up evenly on opposite sides
of the skirt of the DuraCap and High Wind
Cap. See Fig. 17.
DuraCap Cap
Fig. 17 - DuraVent Caps
Flat to 7/12
Over 7/12 to 8/12
Over 8/12 to 9/12
Over 9/12 to 10/12
Over 10/12 to 11/12
Over 11/12 to 12/12
Over 12/12 to 14/12
Over 14/12 to 16/12
Over 16/12 to 18/12
Over 18/12 to 20/12
Over 20/12 to 21/12
Table 1 - Minimum Height From
Roof To Lowest Discharge
Opening Ft.Roof Pitch
Roof Pitch is X/12
FIG. 16B - Location Rules for Flat to 21/12 Pitch
Height above
roof
8’ Min
The vent termination should not be
less than 8 feet from a vertical wall
See Table 1 and
Fig. 16B
FIG. 16C
High Wind Cap

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
15
DURACONNECT II
DuraConnect II Flexible Gas Vent Connector/
Segment is an air-insulated double wall
flexible venting product with comparable
insulating value to Type B Gas Vent. Dura-
Connect II is Listed for two applications.
1. VENT CONNECTOR: May be used as
a connector for Listed gas red appliances
equipped with draft hoods and other
appliances listed for use with Type B Gas
Vent. DuraConnect II may be used where
Type B Gas Vent Connectors are required.
(See Part 1).
2. VENT SEGMENT: DuraConnect II may be
used (unenclosed) as a segment of standard
Type B Gas Vent system in attics or crawl
spaces. (See Part 2).
DuraConnect II may be sized in accordance
with tables applicable to systems with Type
B gas vent connectors, However, DO NOT
ENCLOSE DuraConnect II.
CAUTION - RISK OF FIRE - DO NOT
ENCLOSE. INTENDED FOR USEAS AVENT
CONNECTOR OR FLEXIBLE SEGMENT
OF VENT SYSTEM FOR UNENCLOSED
PORTIONS OF INSTALLATIONS ONLY. Do
not fully enclose or pass through combustible
areas such as walls, ceilings or floors.
Maintain specified minimum airspace
clearance-to-combustibles.
Gas Vent systems by eliminating elbows and
height interference sometimes associated
with xed lengths of rigid single wall or Type B
Gas Vent. Individual lengths are provided with
the same type of joint connector system as
Model BV Type B Gas Vent, permitting simple
attachment. Adaptation to other Type B Gas
Vent may be accomplished by utilizing either
Model BV Universal Female B-Vent Adapter.
2) To size the connector system, follow
approved engineering design practices such
as the National Fuel Gas Code (NFPA 54)
and Canadian Fuel Gas Installation Code
(CSA-B149.1.00). Also check local code
requirements.
3) In using DuraConnect II, overall
considerations should be given to the
following:
a) Make short straight runs where possible.
b) Make no unnecessary bends.
c) Make no bends greater than 90 degrees.
d) Make bends as smooth as possible with
no dips or sags.
e) Install with at least a 1/4” per foot (20mm/m)
rise.
4) DuraConnect II Flexible Connector
is Listed by Underwriters Laboratories
(UL) for 1” (25mm) airspace clearance-to-
combustibles in an unenclosed installation.
THIS PRODUCT SHOULD NOT BE FULLY
ENCLOSED OR PASS THROUGH A
COMBUSTIBLE AREA SUCH AS A CEILING,
WALL OR ROOF JOIST.
5) Use DuraConnect II (combination) Wall/
Ceiling Support Spacers as necessary to
assure correct clearances are maintained
(see Fig. 19).
6) Never cut or modify the DuraConnect II
length. Where possible, choose lengths
which provide for proper overall length. If
necessary, however, DuraConnect II lengths
may be slightly compressed to obtain proper
length (see Fig. 20). Extra care must be
observed when bending the DuraConnect
II in the compressed state. Use only Model
DuraConnect II connector parts. Do not
substitute other exible pipe material.
7) Joint connection design eliminates the
need for screws at joints between exible
sections and/or B-Vent sections. However
short (maximum 1/4” (6mm)) sheet metal
screws may be used if desired. Screws
should not pierce or deform the B-Vent but
may pierce the connector.
These instructions should be observed when
installing DuraVent Type B Gas Vents. For
proper Sizing of the vent refer to the Sizing
Tables found in the “National Fuel Gas Code”,
NFPA 54 in the US or the “Canadian Fuel
Gas Installation Code”, CSA-B149.1-00 in
Canada.
Remove oil and dirt with a solvent and follow
the paint manufacturer instructions. Ordinary
house paints applied directly to steel may not
adhere well and do not prevent underlm
corrosion which leads to paint loosening
and peeling.
NOTE: IN CANADA, ANY PIPE ABOVE THE ROOF
LINE MUST BE OF GALVALUME CONSTRUCTION,
OR PAINTED.
General:
1) DuraConnect II Flexible Connector system
is designed to simplify connection between
gas burning appliances and Model BV Type B

16
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
1) Determine the approximate length and the
path of the connector required to attach to
the B-Vent system and the appliance being
vented.
2) Select a length or lengths of flexible
connector su󰀩cient to extend from the Type
B Gas Vent (which should be protruding into
the appliance room) to the appliance to be
connected. If the inlet of the existing Type
B Gas Vent system is not compatible with
the male end of the exible connector, use a
Model BV Universal Female B-Vent Adapter
or a Universal Female Flexible Connector
which are UL Listed and designed to adapt to
most manufacturer’s Type B Gas Vent (See
Section 3). Insert the outlet (male) end of the
Flexible Adapter into the inlet of the gas vent
until it fully engages. Use #8x1/4” sheet metal
screws to secure in place. (See Figure 19).
3) If local codes specify use of a “drip tee”, a
xed adjustable wye or a tee may be included
to make the connection to the B-Vent.
DuraConnect II may also be used to connect
to the round inlet of Model BVO oval B-Vent
tee if desired (See Figures 22 and 23).
4) Once securely attached to the B-Vent,
gently bend the flexible connector in the
direction of the appliance to which it will be
attached. (Be careful not to make any abrupt
or sharp bends or create any bends greater
than 90 degrees).
5) Attach the inlet (female) end of the exible
connector directly to the appliance draft hood
or ue collar (if conditions and local codes
permit). If necessary, a draft hood connector
may be used between the draft hood/ue
collar and the connector inlet.
6) If the exible connector is too long, do
not cut to length. Instead, compress it to an
appropriate length as noted in Figure 20.
7) After making nal connections, check the
system for soundness of joint attachment
and proper 1” (25mm) airspace clearance-
to-combustibles. Install Wall Support Straps
as necessary to eliminate sags and/or assure
proper clearances.
DuraConnect II as a Vent Connector -
Multiple Appliance System
1) To common vent (connect to more than one
appliance), select and install a xed wye or
tee at the base (inlet) of the Type B Gas Vent
system, along with appropriate increasers
(if necessary) at the inlets. (See Figure 24).
2) Remember to reference the National Fuel
Gas Code (NFPA 54) and Canadian Gas Fuel
Installation Code (CSA-B149.1.00) and/or
local code requirements to obtain the correct
sizes for the connectors and common vent.
3) After selecting and installing the appropriate
tee or wye assembly at the inlet of the gas
vent, connection of the individual appliances
is accomplished in the same manner as
described above for a single appliance
connector system.
AFTER COMPLETING INSTALLATION
OF CONNECTOR AND VENT SYSTEM,
CHECK FOR PROPER VENT OPERATION.
REFER TO GAS VENT INSTALLATION
INSTRUCTIONS AND/OR Z223.1/NFPA 54
AND/OR CSA-B149.1.00 FOR GUIDELINES
ON HOW TO CHECK FOR PROPER
OPERATION.
PART 2
DuraConnect II as an Unenclosed Segment
of a Type B Gas Vent System in Attics or
Crawl Spaces - UNITED STATES ONLY!
DuraConnect II may be used as a segment
of a standard Type B Gas Vent installation
in attics or crawl spaces (only) provided
the installation complies with the following
criteria.
1.) DuraConnect II must never pass through
or penetrate a wall, ceiling, oor or roof joist.
(Such is to be done only with rigid lengths
of B-Vent).
2.) DuraConnect II must never be fully
enclosed.
3.) If installed in an attic, the B-Vent
portion, penetrating the attic oor (to which
DuraConnect II will be attached) must extend
a minimum of three inches above the attic
floor. Note: In Canada, DuraConnect II
cannot be installed in an attic or crawl space.
4.) If installed in an attic, the B-Vent portion
attached above DuraConnect II must be
supported and stabilized using the method
detailed in Figure 25 or by other generic
methods as shown in Figures 25a through
25e.
PART 1
DuraConnect II as a Vent Connector -
Single Appliance System
Use sheet metal screws as necessary to
securely fasten exible length or draft hood
connector to the appliance outlet.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
17
*If local code requires an attic insulation
shield to be installed above the attic oor, the
DuraConnect II B-Vent Segment must extend
above the Attic Insulation Shield.
5.) If installed in a crawl space, rigid B-Vent
must extend through all penetration locations
(wall, ceiling, floor) by at least 3 inches
and must be supported/stabilized by using
a Support Assembly or by other generic
methods as shown in Figure 25 or gures
25a through 25e. NOTE: Not permitted in
Canada.
TO INSTALL:
Select the length of Flexible Connector
su󰀩cient to extend from Model BV Type B
Gas Vent to the appliance to be connected.
Insert the outlet (male) end into the inlet end
of the gas vent until it fully engages. Once
securely attached to Model BV, gently bend
the Flexible Connector in the direction of the
appliance to which it will be attached. Be
careful not to make any abrupt or sharp bends
or create any bends greater than 90 degrees.
Attach the inlet (female) end of the Flexible
Connector directly to the appliance draft hood
or the appliance ue collar.
It is available in 3”, 4” and 5” diameters, both
having 2’, 3’, 4’ and 5’ lengths.
Fig. 19
Fig. 20
Fig. 24
Fig. 23
Fig. 22
Fig. 21
B-Vent Support
Assembly
Attach To Model BV
or Universal Female
Adapter To Attach To
Other B-vent
Firestop
Trim
Collar
Wall Support
Strap
1” (25mm) Min.
Clearance
Furnace or Water Heater
1” (25mm) Min.
Clearance
To Compress Grasp
Firmly And Push
Downward, Working
Up From The Bottom
Until Desired Length
Is Achieved
Attach With Screws
To Wall / Ceiling
Clamp Around Flexible Length
DuraConnect II Wall Support Strap
B-Vent
1” (25mm) Min.
Clearance
Double Wall
Fixed Wye
Or Tee
Tee Cap
1” (25mm) Min.
Clearance
Flexible Connector
Model BV Type B
Gas Vent
1” (25mm) Min.
Clearance
Flexible Connector
Double Wall
Fixed Wye
or Tee
Wall
Support
Strap
1” (25mm) Min.
Clearance
Firestop
Optional Appliance
Adapter Draft Hood
Connector
Model BVO
Oval Double
Wall Tee
Model BVO
Oval Wall Tee
Support
2x4 for support
Trim Collar
Model BVO - 4, 5 or 5/6
Oval Gas Vent Section

18
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Fig. 25c
Fig. 25d
Fig.25b
Fig. 25a
Plumbers Tape
On Four Sides
Equally Spaced
For Supplemental
Support
Storm Collar
Flashing
Model BV
Type B Gas
Vent
DuraConnect II -
Used As a Flexible
Segment of Type B
Gas Vent System -
DO NOT ENCLOSE
3” Minimum B-Vent
Above Floor Joist
Or 1” Above Attic
Insulation Shield
(Where Required)*
3” Minimum B-Vent
Plate Support
Assembly Or Firestop If
Adequately Supported
Below
Model BV Type B Gas Vent
DuraCap Cap
Sheet Metal Plate Attached
To Bottom Side Of Roof Joist.
Plate Trimmed To Accommodate
B-Vent And Create 2 Tabs For
Attaching To Pipe.
Trimmed Plate
Attachment Tabs (One 1/4”
Sheet Metal Screw Per Tab)
Three 1/4” Sheet Metal
Screws Through Snout Of
Flashing Into Outer Wall
Of B-Vent.
Two Strips Of Plumbers Tape
Installed As Shown. Secure
Tape To Roof Joist.
One 1/4” Sheet Metal
Screw To Attach Each
Plumbers Tape To B-Vent
Two Metal Brackets Installed
As Shown. Secure Metal
Brackets To Roof Joist.
One 1/4” Sheet Metal
Screw To Attach Each
Bracket To B-Vent
Roof Joist
Fig. 25
NOTE: In Canada DuraConnect II is NOT
Permitted in an attic space (Figures 25, 25a
to 25e).
Roof Joist
Roof Joist
Roof Joist
Fig. 25e
Roof Joist
Sheet Metal Plate Attached
To Top Side Of Roof
Joist. Plate Trimmed To
Accommodate B-Vent And
Create 2 Tabs For Attaching
To Pipe.
Trimmed Plate
Attachment Tabs (One
1/4” Sheet Metal Screw
Per Tab)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
19
DURACONNECT I
Outlet End
Connects with
Model BV
Type B
Gas Vent
In using DuraConnect I, overall consider-
ations should be given to the following:
a) Make short straight runs where possible;
b) Make no unnecessary bends;
c) Make no bends greater than 90 degrees;
d) Make bends as smooth as possible with
no dips or sags;
e) Install with at least a 1/4” per foot (20mm/m)
rise.
To install: Extend inlet end down over collar
of appliance draft hood and secure in place
with minimum 3 screws (not supplied) through
the inlet end extension of the DuraConnect I
and the collar of draft hood (see Figure 28).
With the DuraConnect I Inlet End secured to
the draft hood, extend to the required length
and secure the Outlet End of DuraConnect I
to the inlet end of the Type B Gas Vent.
Never cut or modify DuraConnect I length.
If necessary, the connector length may be
slightly compressed to obtain proper length
(see Figure 27). Extra care must be observed
when bending the exible connector in the
compressed state.
The DuraConnect I is packaged in a slightly
compressed mode. To extend to the required
length stretch the DuraConnect I to the de-
sired length by grasping the ends and pulling
in opposite directions. This may be an easier
task for 2 people or by attaching the inlet end
to the water heater’s draft hood rst.
Fig. 27 - To extend the
DuraConnect I, grasp
both ends and pull in
opposite directions until
the desired length is
achieved.
Fig. 26 - DuraConnect I is exible and expandable
to a maximum of 60” length, permitting a variety of
orientations
Inlet End
Extension
DuraConnect I is a Single Wall Expandable
Flex Gas Vent Connector, designed for use
as a connector for Listed gas red appliances
equipped with draft hoods and other appli-
ances Listed for use with Type B Gas Vent.
DuraConnect I is designed to simplify a
connection between a gas burning appliance
and Type B Gas Vent systems by eliminating
the need for a separate draft hood connec-
tor, straight pipe and elbows, removing the
guess work of height interference sometimes
associated with xed lengths of rigid single
wall or Type B Gas Vent.
Individual lengths are provided with the
same type of outlet end connector as
DuraVent Model BV Type B Vent, permit-
ting simple attachment. The DuraConnect
I Single Wall Expandable Flex Connectors
are available in 3” and 4” diameters and can
extend from 24” to 42” (3EFC) and from 30”
to 60” (5EFC) in length, allowing a greater
range of installations (see Figure 26).
DuraConnect I Expandable Flex Connector
is Listed by Underwriters Laboratories (UL)
for 1” (25mm) airspace clearance to com-
bustibles in an unenclosed installation. At no
time should this product be fully enclosed or
pass through a combustible area such as a
ceiling, attic, wall, roof joist, or crawl space.
WATER HEATER

20
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
SECTION 2
If local codes specify use of a “drip tee”, you
may incorporate a xed or xed wye or a tee
to make the connection to the Type B Gas
Vent (see Figure 28).
Fig. 28
Secure
DuraConnect I
with a minimum
of 3 sheet metal
screws to collar
of draft hood
Draft Hood
Double Wall
Fixed Wye
or Tee,
if necessary,
or can be
connected
directly to
the rst
length of
Type B
Gas Vent
DuraConnect I
to Water Heater
1” (25mm) Min.
Clearance
Gas Water Heater
Type B
Gas Vent
Tee Cap
MODEL BV LARGE DIAMETERS - 10” - 30”
NOTE: The following pages are additional
information for the installation of the Large
Diameter Type B Gas Vent Model BV.
Reference all requirements found through-out
these instructions.
See Figs. 29 to 31 of graphics illustratiing
the use of components required in the typical
installations of Model BV (10” to 30”) .
Fig. 29 - Type B Gas Vent - Single Appliance
Fig. 31 - Type B Gas Vent - Multiple Appliances
with Manifold
Fig. 30 - Type B Gas Vent - Multiple Appliances
CAP
STORM
COLLAR
FLASHING
PIPE
DRAFT HOOD
CONNECTOR
APPLIANCE
(BY OTHERS)
CAP
STORM COLLAR
FLASHING
PIPE
45° ELBOW
TEE
90° ELBOW
LISTED
APPLIANCE
(BY OTHERS)
CAP
STORM COLLAR
FLASHING
PIPE FIRESTOP
SUPPORT
PLATE
TEE
CAPPED
TEE
CAPPED TEE
APPLIANCES
(BY OTHERS)
(10” to 18” ONLY)
FIRESTOP
SUPPORT
PLATE
FIRESTOP
SUPPORT PLATE