DuraVent Type B Gas Vent Installation Instructions

Installation Instructions MODEL

BV

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.

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L205 464002189 REV.03 06/2022

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 fire or other safety hazard, and may affect 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 matters pertaining to our DuraVent 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]

2

LISTED

MH6357 AND MH14089

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.


TYPE B GAS VENT INSTALLATION

INSTRUCTIONS

CONTENTS

Certification 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, Round Support Bucket . . . . . . . . . . . . . . . . . . . . 12 - 13

Quick-Grip, Offset, Flashings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Vent Terminations . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 - 16

Vent Operation, Painting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

DuraConnect II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 - 20

DuraConnect I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 - 21

SECTION 2 (Large Diameter Model BV - 10” to 30”) . .. . . . . . . . . . . . . . .21 - 27

Ilustrations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .22

Draft Hood Connectors, Firestop Support Plate, Joint Method . . .22 - 24

Adjustable Length, Gas Vent Fittings . . . . . . . . . . . . . . . . . . . . .24 - 25

Terminations, Offset Table, Flashings. . . . . . . . . . . . . . . . . . . . . . . . .25 - 27

Vent Operation, Painting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

SECTION 3 (Model BVO Oval - 4”, 5”, 6”). . . . . . . . . . . . . . . . . . . . . . . .27 - 28

4, 5 , 6-Inch Oval Installation in 2x4 Inch Stud Walls. . . . . . . . . . . . . . 27 -28

4-Inch Oval Installation as B-W Gas Vent . . . . . . . . . . . . . .. . . . . . . . . . . 28

4-Inch Oval Installation as B-W in Multi-Story. . . . . . . . . . . . . . .. . . . .29

Attic Shield, Joint Method - Lock and Unlock . . . . . . . . . . . . . . . . . . .29 - 30

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32


3

CERTIFICATION LABELS

4



SECTION 1

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. and carry the LISTING MARK illustrated here. Type B

Gas Vent has been tested, and listed using all of the supports, firestop, etc., described herein. Deletion or modification of any of the required parts or materials may seriously impair the safety of your installation, and void the certification 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.

WARNING

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.

DO NOT USE

Model BV Type

B Gas Vent for

Category II, III or

IV gas appliances, or for any gas appliance which requires either a pressure-tight or liquid-tight venting system.

FIG. 1 - 3” to 8” BV

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 effects 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.

2. TYPES OF APPLIANCES AND BUILDINGS

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 specified for use with Type B gas vent producing flue 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, floor 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.

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, orient sections as shown in Fig.1 and push adjacent pieces together until fully engaged.

NOTE: Some local jurisdictions require a supplemental screw(s) at joints to prevent disengagement 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 finger or

5


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 24, SECTION 2 IN

THESE INSTRUCTIONS.

5. VENT CLEARANCES, LOCATION AND

ENCLOSURES

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!

DuraCap

Cap

Storm

Collar

Flashing

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


45°/60° Elbows

Keep electrical wires and building insulation away from gas vent and out of the required air space

25mm (1”)

Clearance to

Combustibles

Enclosure

Support Plate

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 floor to maintain connector clearance.

25mm (1”)

Clearance to

Combustibles

Attic Insulation

Shield

Gas Vent

Length

Draft Hood

Connector

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 floors, walls, roofs or framed spaces. The appropriate clearance should be observed to joists, studs, subfloors, plywood, drywall, or plaster enclosures, insulating sheathing, rafters, roofing, 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 21-27 (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”.

FIG. 2 - Typical Installation of Model BV (3” to 8”)

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.

6

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.



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 this chase be insulated to a minimum of R-12 (RSI 2.1).

- Rigid type insulation is recommended. If a non rigid type is used, 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 off.

- It is recommended to provide an access panel for future inspection and cleaning of the vent.

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 off, 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 fire-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.

Type B Gas Vent

Storm Collar

Adjustable

Flashing

DuraCap

Cap

Storm Collar

Attic

Insulation

Shield

Use an Attic Insulation

Shield in the attic space or enclose the vent completely. Maintain the required minimum airspace clearance to enclosure, wires and building insulation.

Attic

Insulation

Shield

Adjustable Flashing

(Attic)

FIG. 4 -

Typical Ceiling and Roof

Penetrations

Wall

Support/

Band

R12 Min.

Insulation

25mm (1”)

Clearance to

Combustible

Material

FIG.3 - Exterior

Enclosed Type B Gas

Vent

Wall

Tee

Firestop

Spacer or

Wall Thimble

Fixed

Length

Tee Cap Adjustable

Length

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 selection 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.

7


90° Elbow

Adjustable

Length

Increaser

45°/60°

Elbow

Common Vent

Tee

Increaser

Type B

Vent

8. ATTIC INSULATION SHIELD

For diameters 3” to 8”, install an Attic Insulation 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 required by the National Building Code. The Attic

Insulation shield is adjustable from 11” to 20”.

Type B

Vent

45°/60°

Elbow

Draft Hood

Connector

Draft

Hood

Connector

FIG. 5 - Combined vent system using type B Parts starting with Draft Hood Connectors.

Where height restrictions will not permit the use of the Attic Insulation Shield, it is permissible 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.

7. FIRE STOPPING

All Type B Gas Vents passing through floors, ceilings or walls must be firestopped 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 floor, 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, firestopping is provided by the vertical walls of the shaft. Any openings in the chase/ shaft below the roof must be firestopped.

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 floor joist.

Install the AIS from above and secure base with nails or wood screws.

Seal the vapour barrier to the firestop or ceiling support assembly using a high temperature 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.

Firestop placed on top of floor or framed opening.

Firestop

Spacer/Support

Plate

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 establishes 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.

Firestop

Spacer nailed in place

FIG. 7 - Wall

Support/Band

#10x1-1/4” Wood Screw

(4plcs - to Wall)

Firestop Spacer/Support

Plate to be framed on all

4 sides

Maintain minimum airspace clearance to combustibles, wires and insulation

FIG. 6 - Fire Stopping Required for all Ceiling/

Floor Levels

8 1/4” #20x1-1/4”

Screw Nut


#8x1/4po Slotted

Hex Head Screw at 3 holes if used as a Support


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.

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, first 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.

10. USE OF GAS VENT FITTINGS

Do not cut gas vent pipe or fittings. Adjustable

Lengths are telescoped over fixed lengths, to accommodate odd distances between vent lengths or connectors. An Adjustable Length suspended below a support serves as an expansion joint between two fixed 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 effective vent draft.

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.

FIXED WYE - SIZES AVAILABLE

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”

CAUTION: WEAR GLOVES WHILE HAN-

DLING METAL PARTS TO AVOID PERSONAL

INJURY, SHARP EDGES OR PROJECTIONS

CAN CUT YOU.

On many newer gas appliances designed with efficiencies of 78% to 83% (mid-efficiency appliances, commonly referred to as fan assisted appliances), it is important that the

Wall

Support/

Band connector system maintain the maximum amount of heat as possible, in order to reduce

90°

Elbow

Adjustable Length

Type B

Vent

Firestop

Spacer or Wall

Thimble

Draft Hood

Connector

Tee

Tee

Cap 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 fixed wye fitting is available for maximum installation flexibility.

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.

FIG. 8 - Interior Wall Penetration for Type B Vent

The lower section is connected to the main

9


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 60 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 fitting 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”.

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.

45/60

Elbow

Adjustable

Length

Type B

Vent

45/60

Elbow

Draft Hood

Connector

Common Vent

Fixed Wye

Type B Vent

45/60

Elbow

Draft

Hood

Connector

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.

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 ADAPTER - INSTALLATION

The male adapter is a fitting 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 specific 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”.

FIG. 9 - Fixed Wye

Selkirk(current and former)

Household Mfg. HVAC

Eljer HVAC

AirMate

Hart & Cooley

10



Using the holes in the outer wall of the adapter as a guide, drill two holes through 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.

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 ensure they have sufficient vent height. Refer to the appliance manufacturer instructions and local codes for required minimum heights.

FEMALE ADAPTER - INSTALLATION

The female adapter is a fitting 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.

FIG. 11 - MINIMUM VERTICAL HEIGHT

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


11

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. It is permissible to use the clamping band with a generic 26 gauge or heavier plate

(if space requirements dictate).

FIRESTOP/SUPPORT PLATE

The Firestop/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 floor level.

Cut away and frame a four sided opening in the floor 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).

ROUND SUPPORT BUCKET (RSB)

The Round Support Bucket has been tested to support a maximum of 35’ of Type B Gas

Vent. Two supports are available: one to accomodate diameters of 3” and 4” and one for diameters of 5” and 6”. A knockout is provided in each of the RSB for the larger diameters (4” and 6”).

Each RSB comes complete with:

1 - Round Support Bucket

2 - Hanger Brackets

2 - Hanger Bars

2 - Pipe Supports (3” & 4” and 5” & 6”)

Support Plate may be trimmed or replaced with custom size, generic plate if necessary, as long as the required clearances are respected

Clamping

Band

FIG. 12 - Firestop/Support Plate Assembly

Round Support Bucket (RSB)

Install the Hanger Bars through pairs of triangular openings in the side of the RSB.

The open portion of the U-shaped Hanger

Bar to be facing downward as shown below.

Insert the first length from above through the clamping 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 fire 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.

RSB and Hanger Bars

Nail both Hanger Brackets into the sides of joists.

12 Hanger Brackets



The bottom edge of the Hanger Bracket should be even with the bottom edge of joists. Use four (4) nails per bracket, nailing through small holes in the brackets (see below).

DO NOT RELY ON TRIANGULAR-SHAPED

BARBS TO HOLD BRACKETS IN PLACE.

BRACKETS MUST BE NAILED TO JOISTS.

Sheet

Metal

Screws

Bolt

Nut

Pipe Support

Pipe Support

Sheet

Metal

Screws

16” on center

Re-insert the assembly through the Round

Support Bucket opening from above until the Pipe Support (now attached to the pipe) rests on the bottom of the Round Support

Bucket. Connect to the lower pipes from the appliances (see below).

Hanger

Bracket

4 Nails Per

Side

Joist

Hanger Brackets

Round

Support

Bucket

Firestop Spacer installed from above

Snap the Hanger Bars previously assembled to the Round Support Bucket into the slots in the Hanger Bracket.

Slide the Pipe Support over the B Vent

Length with the flanged edge to the bottom so it will make contact with the inside bottom of the Round Support Bucket. Slide the length through the round opening in the Round

Support Bucket (if a 4” or 6” pipe is being installed, remove the knockout) where it will be joined to the adjacent pipe below.

Pipe

Support

Hanger

Bars

Mark the proper elevation of the Pipe Support on the B Vent Length. Remove the length from the Round Support Bucket. Round Support Bucket through Floor

Using the elevation previously marked, locate and secure the Pipe Support with nut and bolt, drawing tabs together. Insert

1/4” screws (provided) through pre-punched holes in the Pipe Support and into the outer wall of the Length to prevent any slip.

The Round Support Bucket does not serve as a firestop. A Firestop Spacer is required where the B Vent passes through a ceiling or floor joist. An Attic Insulation Shield is required if an attic space is immediately above the Round Support Bucket.

If an additional support is required, the

Firestop/Support Plate or the Quick Grip

Firestop/Support may be used on another floor level.

13


QUICK GRIP - FIRESTOP/SUPPORT

1. At the desired location, cut a square or circular hole in the floor at a minimum of

2-1/2 inches larger than the nominal pipe 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 fingers 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.

Gripping fingers facing upward

FIG. 13 - “Quick Grip” Firestop/Support collar to the pipe at the appropriate place.

Apply silicone sealant over the sheet metal screw head. Gas vents supported only by the flashing 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.

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 flat roofs only (see Fig.

14). It is nailed in place through all four sides of the base flange. The Adjustable

Roof Flashing (see Fig. 15) is positioned with the lower portion of the base flange over roofing material and the upper portion of the base flange under the roofing material. Nail through only the upper portion and sides of the base flange. (DO NOT nail through lower flange.) Use nails with a neoprene washer, or cover the nail heads with a silicone sealant.

Finish roofing around the flashing, covering the sides and upper areas of the flange with roofing material. A non-hardening sealant may be used around the edges of the flashing base where it meets the roof.

Nominal Pipe

Size (inches)

3

4

5

6

Min. Hole

Size (inches)

5.5

6.5

7.5

8.5

Max. Hole

Size (inches)

7

8

9

10

FIG. 14

Tall Cone Flashing For

Flat Roofs Only

Storm Collar

Apply a Non-

Hardening

Silicone Sealant

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 flashing may be suspended from the flashing. (The pipe may be supported by the storm collar resting on the top of the flashing). Use 1/4 inch long sheet metal screws to attach the storm

14

Top and Sides of Flashing under Roofing

Maintain minimum

25mm (1”) clearance to combustible and

BV Type B Gas Vent


Flashing

FIG. 15 - Flashing Installation

Bottom of

Flashing over

Roofing


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 flashing.

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 1: For Pipes 12” and Under

The top is suitable for installation on listed gas vents terminating a sufficient 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.

Rule 2 - 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 2 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.

DuraCap

Cap

12” Minimum distance to roof

Non-Hardening

Silicone Sealant

Storm Collar

Flashing

FIG. 16A - Roof Pitch 7/12 or Less

Height above roof

Roof Pitch is X/12

Table 1 - Minimum Height From

Roof To Lowest Discharge

Roof Pitch

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

Opening Ft.

1.0

1.5

2.0

2.5

3.25

4.0

5.0

6.0

7.0

7.5

8.0

FIG. 16B - Location Rules for Flat to 21/12 Pitch

FIG. 16C

8’ Min

The vent termination should not be less than 8 feet from a vertical wall

See Table 1 and

Fig. 16B

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 onto the upper end of the pipe until joint is fully/properly engaged.

Engage the DuraTab® (with finger 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.

15


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 underfilm corrosion which leads to paint loosening and peeling.

DuraCap Cap High Wind Cap

Fig. 17 - DuraVent Caps

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 flame toward or into the draft hood.

Improper venting, indicated by escape or spillage of burned gas, will cause match to flicker 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.

NOTE: IN CANADA, ANY PIPE ABOVE THE ROOF

LINE MUST BE OF GALVALUME CONSTRUCTION,

OR PAINTED.

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.

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 fired 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.

16

FIG. 18 - Match Test for Spillage

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.

CAUTION - RISK OF FIRE - DO NOT

ENCLOSE. INTENDED FOR USE AS A VENT

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.

General:

1) DuraConnect II Flexible Connector system is designed to simplify connection between gas burning appliances and Model BV Type B



Gas Vent systems by eliminating elbows and height interference sometimes associated with fixed 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 or Male

B-Vent Adapters.

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-tocombustibles 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 flexible pipe material.

7) Joint connection design eliminates the need for screws at joints between flexible sections and/or B-Vent sections. However short (maximum 1/4” (6mm)) sheet metal

Use sheet metal screws as necessary to securely fasten flexible length or draft hood connector to the appliance outlet.

PART 1

DuraConnect II as a Vent Connector -

Single Appliance System

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 sufficient 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 flexible 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 fixed 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 flexible connector directly to the appliance draft hood or flue collar (if conditions and local codes permit). If necessary, a draft hood connector may be used between the draft hood/flue collar and the connector inlet.

6) If the flexible connector is too long, do not cut to length. Instead, compress it to an appropriate length as noted in Figure 20.

7) After making final connections, check the system for soundness of joint attachment and proper 1” (25mm) airspace clearanceto-combustibles. Install Wall Support Straps as necessary to eliminate sags and/or assure proper clearances.

screws may be used if desired. Screws should not pierce or deform the B-Vent but may pierce the connector.


17

DuraConnect II as a Vent Connector -

Multiple Appliance System

1) To common vent (connect to more than one appliance), select and install a fixed 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.

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 figures

25a through 25e. NOTE: Not permitted in

Canada.

*If local code requires an attic insulation shield to be installed above the attic floor, the

DuraConnect II B-Vent Segment must extend above the Attic Insulation Shield.

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.

TO INSTALL:

Select the length of Flexible Connector sufficient 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 flue collar.

It is available in 3”, 4” and 5” diameters and in 2’, 3’, 4’ and 5’ lengths.

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, floor 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 floor (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 - 25e.

18

B-Vent

1” (25mm) Min.

Clearance

Attach To Model BV or Universal Female

Adapter To Attach To

Other B-vent

Fig. 19

Fig. 20


Support

Assembly

Firestop

Trim

Collar

Wall Support

Strap

1” (25mm) Min.

Clearance

Furnace or Water Heater

To Compress Grasp

Firmly And Push

Downward, Working

Up From The Bottom

Until Desired Length

Is Achieved


DuraCap Cap

Attach With Screws

To Wall / Ceiling

Clamp Around Flexible Length

DuraConnect II Wall Support Strap

Fig. 21

B-Vent

Storm Collar

Flashing

3” Minimum B-Vent

Model BV

Type B Gas

Vent

Plumbers Tape

On Four Sides

Equally Spaced

For Supplemental

Support

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) *

Plate Support

Assembly Or Firestop If

Adequately Supported

Below

Model BV Type B Gas Vent

1” (25mm) Min.

Clearance

Flexible Connector

Double Wall

Fixed Wye

Or Tee

Tee Cap

1” (25mm) Min.

Clearance

Fig. 25

Fig. 22

Firestop

Model BVO - 4, 5 or 5/6

Oval Gas Vent Section

Trim Collar

Model BVO

Oval Double

Wall Tee

Model BVO

Oval Wall Tee

Support

2x4 for support

Optional Appliance

Adapter Draft Hood

Connector

Model BV Type B

Gas Vent

1” (25mm) Min.

Clearance

Fig. 23

Double Wall

Fixed Wye or Tee

Wall

Support

Strap

Flexible Connector

1” (25mm) Min.

Clearance

Fig. 24

Sheet Metal Plate Attached

To Bottom Side Of Roof Joist.

Plate Trimmed To Accommodate

B-Vent And Create 2 Tabs For

Attaching To Pipe.

Roof Joist

Three 1/4” Sheet Metal

Screws Through Snout Of

Flashing Into Outer Wall

Of B-Vent.

Fig. 25a

Fig.25b


Roof Joist

Trimmed Plate

Attachment Tabs (One 1/4”

Sheet Metal Screw Per Tab)

19

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

Fig. 25c

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. 25d

Roof Joist

DURACONNECT I

DuraConnect I is a Single Wall Expandable

Flex Gas Vent Connector, designed for use as a connector for Listed gas fired appliances equipped with draft hoods and other appliances 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 connector, straight pipe and elbows, removing the guess work of height interference sometimes associated with fixed 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, permitting 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 combustibles 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.

Attachment Tabs (One

1/4” Sheet Metal Screw

Per Tab)

Trimmed Plate

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.

Fig. 25e

WATER HEATER

NOTE: In Canada DuraConnect II is NOT

Permitted in an attic space (Figures 25, 25a to 25e).

20

Fig. 26 - DuraConnect I is flexible and expandable to a maximum of 60” length, permitting a variety of orientations



In using DuraConnect I, 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.

Secure

DuraConnect I with a minimum of 3 sheet metal screws to collar of draft hood

Type B

Gas Vent

1” (25mm) Min.

Clearance

DuraConnect I to Water Heater

Draft Hood

Fig. 27 - To extend the

DuraConnect I, grasp both ends and pull in opposite directions until the desired length is achieved.

Outlet End

Connects with

Model BV

Type B

Gas Vent

Gas Water Heater

Double Wall

Fixed Wye or Tee, if necessary, or can be connected directly to the first length of

Type B

Gas Vent

Tee Cap

Inlet End

Extension

Fig. 28

If local codes specify use of a “drip tee”, you may incorporate a fixed or fixed wye or a tee to make the connection to the Type B Gas

Vent (see Figure 28).

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 flexible connector in the compressed state.

SECTION 2

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 illustrating the use of components required in the typical installations of Model BV (10” to 30”) .

The DuraConnect I is packaged in a slightly compressed mode. To extend to the required length stretch the DuraConnect I to the desired 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 first.

21


CAP

FLASHING

FIRESTOP

SUPPORT PLATE

APPLIANCE

(BY OTHERS)

DRAFT HOOD

CONNECTOR

(10” to 18” ONLY)

Fig. 29 - Type B Gas Vent - Single Appliance

CAP

STORM COLLAR

FLASHING

45° ELBOW

FIRESTOP

SUPPORT

PLATE

90° ELBOW

STORM

COLLAR

PIPE

PIPE

TEE

LISTED

APPLIANCE

(BY OTHERS)

Fig. 30 - Type B Gas Vent - Multiple Appliances

CAP

STORM COLLAR

FLASHING

PIPE

FIRESTOP

SUPPORT

PLATE

CAPPED

TEE TEE

Type B Gas Vent Connectors

Attach the vent section directly to the draft hood of the appliance with three (3) sheet metal screws. Maintain the UL minimum airspace clearance to combustibles. Where the vent penetrates structure, use a Firestop and the Support Assembly to maintain proper clearance at this and successive intervals throughout the structure.

Basic Vent Structure

Large Diameter Model BV is available in sizes 10” to 30” and has a 1/2” space between pipe walls. When calculating the assembled length, allow 1” length reduction for the overlap at each joint.

Maintain minimum airspace clearance to combustibles, wires, and insulation:

1” - for 3” thru 30” installed in the U.S.A.



Draft Hood Connectors

Draft Hood Connectors must be attached to the appliance outlet with screws. Draft

Hood Connectors are available in 10” to 18” diameters.

The accepted practice for larger diameters

(20” to 30”) is to attach a starting Length of

12” directly to the apliance flue outlet. Secure the Length to the appliance flue outlet with a minimum of three #8 x 1” sheet metal screws equally spaced using the existing outer wall lock slots as insertion point (see Fig. 32).

22

CAPPED TEE

APPLIANCES

(BY OTHERS)

Fig. 31 - Type B Gas Vent - Multiple Appliances with Manifold

Fig. 32


Fig. 33


Secure the screws until the head of the screws are flush with the outer casing (see

Fig. 33). Penetrating through the inner wall is acceptable only at this point to secure to the appliance flue outlet.

SUPPORT OF VENT STRUCTURE

The Firestop Support Plate (FSP) is designed to be used with Type B Gas Vents in diameters of 10” to 30”. The Vent Pipe Hanger (SBA) is designed for use with 10” and 12” diameters only. They are used to provide lateral and some vertical support for sections of vent, as well as the correct clearance to combustible materials. They also provide support and resupport for offsets and horizontal runs. In addition, field fabricated supports may be used. Consult local building codes for rules regarding field fabricated supports.

4. Mounting holes are provided around the perimeter of the Firestop Support Plate. Use appropriate fasteners to secure the Support

Plate halves to the opening between floors.

(Firestop Support Plates should be attached to the TOP of the opening only). See Figure

36.

Fig. 35

Firestop Support Plate (FSP)

Each Firestop Support Plate is designed to support up to 30 feet of Vent Pipe when installed as follows.

5. For installations with multiple supports, an Adjustable Length Section of Type B Gas

Vent should be installed between each pair of

Firestop

Support

Plate

1. It is recommended that the vent pipe be supported at least every other floor. The distance between supports must not, in any case, exceed 30 feet.

2. The circular cutout in the Firestop Support

Plate is designed to engage the uppermost recess in the female end of the vent pipe

(see Fig. 34).

3. Surround the vent pipe with the two identical Firestop Support Plate halves (see

Fig. 35). Engage the plate edges in the uppermost recess as described in Step 2.

Use two pair of bolts and nuts to hold the plate halves together. Four predrilled tabs are provided for this purpose.

Adjustable

Length

Section

Firestop

Support

Plate

Adjustable

Length

Section

30 Feet

Maximum

Maximum

30 pieds

Fig. 34

Uppermost

Recess

Firestop

Support

Plate

Adjustable

Length

Section

Appliance

Draft Hood

Fig. 36

23


locations where a support is used (see Figure

36). This allows the location of the pipe recess to be in the proper position at each opening where a support is to be used. The Adjustable

Length Section also provides relief for linear thermal expansion. The Adjustable Length

Section should be positioned directly under the vent pipe section that is being supported.

Adjustable Length Section

An 18” Adjustable Length Section (18A) is available for Large Diameter Type B Gas

Vent. It telescopes over fixed lengths to accommodate odd distances or to achieve specific dimensions between vent lengths or connectors. Sizes 10-inch and above are secured using two sheet metal screws equally spaced around the mating section.

BV GAS VENT JOINT METHOD -

10” TO 30”

TO LOCK JOINT

1. Line up seams of both pipes (ensure UP ARROW on label is pointing up or away from the appliance).

See Step 1.

Step 1

Adjustable Length Section may also be used to compensate for linear thermal expansion between two fixed points in the vent system.

Examples of this are shown in Figure 36. In these examples the fastening devices are not used. This allows for expansion between two fixed supports or between a fixed support and the appliance. Note that the fastening means should be left loose only if the Vent and the

Adjustable Length Sections are installed vertically. If the Adjustable Length Sections are used in a position other than vertical, such as between offsets, the fastening means should be used. Finally, when joining an

Adjustable Length Section to another section of Type B Gas Vent, make sure that there is a minimum overlap of two inches. DO NOT

USE Adjustable Lengths to suspend any weight of pipe below.

2. Press down on pipe all the way around until you hear a snapin-place sound. The pipes are now firmly connected. See Step 2.

TO UNLOCK JOINT

3. Pry out all lances

(teeth). Rotate joint slightly while gently pulling apart. See

Step 3.

Step 2

Step 3

USE OF GAS VENT FITTINGS

Model BV tees, elbows, increasers, and short lengths are specially designed to facilitate interconnections.

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 effective vent action.

A Wall Thimble is available in diameters of

10” and 12” only. It is used where a Type

B Gas Vent passes through a vertical wall.

The Wall Thimble will provide for the proper clearance to combustible material as the vent passes through the wall, and will also act as a firestop for the vent. NOTE: For larger diameters (14” to 30”) a Firestop Support

Plate (FSP) must be used installed in a fully framed opening at the required air space clearances to combustible materials.

24



Elbows are used to offset installation to avoid obstructions such as rafters and joists.

Diameters 10” to 14” are fully adjustable from 0° to 45°. Diameters 16” to 30” are non-adjustable.

Termination of Vent Must be Securely

Guyed or Braced if it Extends more than

5 Feet Above Roof

Increasers

An Increaser is used to make a transition from a smaller vent diameter to a larger vent diameter. The Increaser is available in steps up to a maximum of four (4) sizes larger. For examples:

- A 10-inch diameter can be increased with a single Increaser up to 18-inch;

- A 22-inch diameter can be increased with a single Increaser up to 30-inch.

Seal Around

Collar and

Flashings

Maintain Proper

Clearance

Firestop

Support

Assembly

See

Table 1 - page 14

Elbow

Resupport

Lateral Support

Tees

Tees are available from 10” to 30” and are designed for breeching or as connectors for vertical, sloped, or horizontal systems.

They can also be used to provide access for inspection and cleaning. Tees must be isolated from expansion forces by supporting as needed and with Adjustable Length

Sections. Any unused open end of the Tee should be closed off with a Tee Cap.

Terminate

Vent

At Least 5

Feet

Above Draft

Hood

Maintain Proper

Clearance

Vertical Vent

Draft Hood

Connector

Listed

Appliance

Adequate

Air Supply

Termination of Vent Structure

Two Termination Caps are available. A High

Wind Cap is available for diameters from

10” to 18”. The High Wind Cap is designed with the same lock as the female end of vent sections. A Universal Cap is available in diameters of 20” to 30”. The Universal Cap is designed to fit inside of the inner wall of vent sections. For 10” and 12” the the terminations must terminate in accordance with section 14 and Table 1 (Fig. 16B) on page 15.

Fig. 37

Whenever the vent is changed from a vertical direction, the vent system must be resupported before and after the change in direction. The support should provide rigid stability, both vertically and horizontally (see

Fig. 37). Check with your local Building

Officials to make sure any alternative support method is acceptable.

CAUTION

WHERE HEAVY SNOWFALL OCCURS,

THE CAP SHOULD BE INSTALLED

TO MEET THE ABOVE MINIMUM

HEIGHT REQUIREMENTS ABOVE THE

AVERAGE SNOW DEPTH.

25


20

22

24

26

Dia.

10

A B

5-7/8 5-3/8

Maximum Offset Table in inches

With

Two

45°

Elbows

Only

With Two 45° Elbows and:

12” 18” 24” 36”

7-1/4 15 19-1/4 23-1/2 32

12

14

16

18

6

6-5/8

7

7-9/16

5-3/8

6-1/2

7

7-1/2

7-1/4

8-1/2

9-1/4

10

15

16-1/4

17

17-3/4

19-1/4 23-1/2

20-1/2

21-1/4

22

24-3/4

25-1/2

26-1/4

32

33-1/4

34

34-3/4

8-1/2

8

8-5/8

7-5/8

10-1/4

10-1/4

8-5/8 8-5/16 11-1/4

18

18

19

22-1/4

22-1/4

23-1/4

26-1/2

26-1/2

27-1/2

35

35

36

28

30

9

9-1/2

10

9

9-1/2

12

12-3/4

19-3/4 24

20-1/2 24-3/4

28-1/4 36-3/4

29 37-1/2

10 13-1/2 25-1/2 13-1/2 29-3/4 38-1/4

Offset

45°

Vertical

Rise

NOTE: The vertical rise can be closely estimated by adding one

“A” and one “B” dimension to

Maximum Offset

For diameters 14” to 30”, the termination must terminate as per Figures 38 and 39.

A cap or chimney housing offers resistance to the entrance 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 due to a wind that impinges directly upon the vent. A reminder also to homeowners to check the rain cap for icing during low ambient temperatures.

However, no vent cap, cowl, or top can overcome the adverse effect of a region of high static pressure around the vent terminal or the effect of an interior region of low pressure. Regions of high static pressure around the vent terminal can be avoided by following the general rule for the vent termination given previously. Low or negative interior pressures in the building may be caused by (1) failure to provide for combustion air, (2) excessive use of exhaust fans, and (3) tight construction resulting in the lack of infiltration air.

26

10’ MIN

2’ MIN

Fig. 38

1. To ensure a waterproof roof structure, use the appropriately sized flashing and storm collar where the vent penetrates the roof. Place the Storm Collar over the vent until it is level. Apply a thick horizontal ring of nonhardening, high-temperature sealant such as silicone, around the vent at the top of the Storm Collar.

2. Vents in excess of 5 feet above the roof should be securely guyed to prevent unnecessary movement. Attach guying to the vent. Never attach guying to the cap.



SECTION 3

10’ OR LESS

2’ MIN 2’ MIN

WALL OR

PARAPET

Fig. 39

2’ MIN

3. To prolong life and appearance of galvanized steel parts located outside, use proper painting procedure.

NOTE: NO

HEIGHT ABOVE

PARAPET

REQUIRED

WHEN DISTANCE

FROM WALLS

OR PARAPET IS

MORE THAN 10’ a. Remove oil and dirt with a solvent.

b. Paint with primer specifically recommended for adhesion to galvanized steel.

c. Apply finish coat.

Basic Vent Structure

Model BVO Oval Gas Vent is available in sizes 4, 5, and 6- inch and is listed to UL441.

The individual sizes reflect the flow rate capacities equivalent to 4-inch, 5-inch, and

6-inch Round Type B Gas Vent. The joint of the Model BVO Type B Oval Gas Vent takes up one inch when assembled. Model BVO

Oval Gas Vent is UL-listed for the following applications and clearances to combustibles as shown in the Table below. NOTE: Model

BVO Oval is not approved in Canada.

Checking Vent Operation

After adjusting appliance and lighting main burner, allow several minutes for warm-up to begin venting action.

For water heaters and equipment with draft hoods, hold a lighted match along the rim of the draft hood relief opening of the appliance.

Proper venting will draw the flame up or into the draft hood. Improper venting, indicated by escaping or spilling of burned gas, will cause the match to flicker or go out. When consulting Standard NFPA 54 or CSA-

B149.1-00., follow procedures for conducting safety inspections of existing appliances and placing equipment in operation, paying particular attention to the section titled

Checking the Draft (see Fig. 18).

Painting

For any CAN/ULC-S605 applications any exterior exposed gas vent above the roofline will require painting to prolong the life and appearance of the galvanized steel outer casing. Use proper painting procedure at time of installation. Remove oil and dirt with a solvent. Paint first with a good quality zinc primer or other primer recommended for use on galvanized steel. Next apply an appropriate finish coat.

Underwriters Laboratories-listed

Minimum Clearances to Combustibles

Oval Description Type

Minimum

Clearance

U.S.A. Only

Model BVO (UL441)

4”, 5” and 6”

B 1”

4” and 5”

(when installed in

2x4 stud wall with other-than-recessed heater)

4”

(when installed in

2x4 stud wall with recessed heater)

B 2x4

B-W

Clearances as determined by use of 4OFS or

5OFS firestop spacers at each ceiling level

Clearances as determined by use of 4OHD ceiling plate spacers, and

4OFS firestop spacers

Model BVO Oval Type B Gas Vent is available in sizes 4, 5, and 6-inch, and requires a 1-inch clearance to combustibles. This includes all

Vent Sections, Elbows, Tees, and Adapters.

When used as Type B Gas Vent, Model BVO

Oval Gas Vent must follow all of the same requirements as round Type B Gas Vent, such as the necessity of using firestops at each floor level. See Section 1.

27


Type B 2 x 4 Gas Vent - 4” or 5” Oval

Four- and five-inch Model BVO Oval Gas

Vent may be installed within a standard

2x4 stud wall if all the following conditions are met.

1. Arrows on parts should always point up.

2. Stud bay must be a 16-inch, on-center stud bay.

3. 2x4 studs must be a minimum of 3.5 inches deep.

4. There must be nothing else in the stud bay other than the Vent Section. This includes any type of insulation.

5. The Firestop Spacer (FS) must be installed at each floor level. See Figure 40.

NOTE: Only the straight Vent Pipe Sections, with or without the Oval Tee, may be used inside the stud bay with reduced clearances to combustibles. See Figure 40.

Type B 2x4

Installation

E with the Oval Tee Cap, and the Vent Pipe (D) as shown on Figure 40.

4. At each floor level above the Tee, install the Firestop Spacer (E) seen in Figure 40.

NOTE: Provide at least a 1-inch clearance around the Tee branch where it passes through combustible wall.

Type B-W Gas Vent - 4” Oval

Model BVO Oval Gas Vent may be installed within a standard 2x4 stud wall if all the following conditions are met.

1. Arrows on parts should always point up.

2. Stud bay must be a 16-inch, on-center stud bay.

3. 2x4 studs must be a minimum of 3.5 inches deep.

4. There must be nothing else in the stud bay other than the Vent and furnace. This includes any type of insulation.

5. The installation must contain an Oval Hold-

Down Plate (4OHD) at the base, Oval Plate

Spacers (4OPS) at the first ceiling level, and

Firestop Spacers (4OPS) at any additional floor levels. See Figures 41 and 42.

D

C

B

A

Fig. 40

Installation of Type B 2 x 4 Gas Vent

1. Cut out the ceiling plate in the space where the Vent is to be installed.

2. Nail a 2x4 support (A) at the desired height between the studs. See Figure 40.

3. Attach the Tee Support (B), the Tee (C)

28

Installation of Type B-W Gas Vent

1. Cut out the ceiling plate at the floor level above the heater flush with studs in space where Vent is to be installed.

2. Nail one Plate Spacer (40PS), (A), across cut-out area in ceiling plate. See Figure 41.

Plate Spacer (4OPS) is required at the first ceiling level above a wall furnace to center and space vent properly and to provide the required opening between floors.

3. Snap Hold-Down Plate (4OHD), (B), onto bottom end of pipe as shown in Figure 41.

Install Vent Section in position. Use two No.

8 binder head sheet metal screws to attach

Hold-Down Plate firmly to Furnace header plate through pre-punched holes.

4. Nail second Plate Spacer across cutout ceiling plate as shown in Figure 41. Firestop

Spacers (OFS) must be used at subsequent levels.

5. If the Vent is to continue additional stories within a 2x4 stud space, install Firestop

Spacers at the second and subsequent ceiling levels as shown in Figure 42.



6. After passing through the last Firestop

Spacer, the Vent may be finished with either round or oval fittings, flashings and Cap.

(Round pipe, fittings, flashings, and vent caps cost less than corresponding oval parts.)

Type B-W

Installation

A

Attic Insulation Shield

In some areas, the building code requires the use of an attic insulation shield (AVS) on single-story Type B-W installations.

Model BVO Attic Insulation Shield attaches to the top surface of the ceiling plate where oval wall-heater vent enters the attic. The shield prevents mass-type insulation (rock-wool, vermiculite, etc.) from filling or obstructing the ventilated stud space ablove the heater.

STEP 1:

Fold along perforations into rectangular shape with spacer beads on inside.

STEP 2:

B

Fig. 41

Multi-Story Type B-W

Installations AT SECOND AND

SUBSEQUENT

CEILING LEVELS,

USE 4OFS

FIRESTOP

SPACERS Lock by bending tabs outward. Be sure small flap is on outside as shown.

STEP 3:

AT FIRST CEILING

LEVEL, USE 4OPS

CEILING

PLATE

SPACERS

Bend end flanges out along perforations to fit type of constructions (see above).

Fig. 42


29

STEP 4:

CEILING PLATE

SPACERS

Rectangular end flanges (A) are bent along perforations to fit 2” x 4”, 2” x 6” or 2” x 8” joists as required. Make sure bottom edge of shield rests on or overlaps ceiling plate spacers.

Locking of Joints

1. Place female coupler over preceding male coupler.

2. Press side of pipe down until joint seats.

3. Press other side of pipe down until joint is engaged.

Unlocking of Joints

1. Insert screwdriver one inch into joint as shown.

2. Press firmly inward with blade of screwdriver and pry upwards VERY

SLOWLY AND GENTLY.

Joint will slowly separate without damage.

30


NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE. NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

31

DuraVent, Inc. (“DuraVent”) provides this limited lifetime warranty for all of its products with the exception of

Ventinox® (lifetime), and PolyPro® (ten years). Subject to the limitations set forth below, DuraVent warrants that its products will be free from defects in material or manufacturing, if properly installed, maintained and used.

DuraVent products are fully warranted if installed only by a professional installer. This Warranty is transferable from the original homeowner to the buyer of the home. This warranty does not cover normal wear and tear, smoke damage or damage caused by chimney fires, acts of God, or any product that was: (1) purchased other than from an authorized

DuraVent dealer, retailer or distributor; (2) modified or altered; (3) improperly serviced, inspected or cleaned; or

(4) subject to negligence or any use not in accordance with the installation instructions included with the product as determined by DuraVent. Installation instructions are available online at www.duravent.com under Support/

Literature and through our Customer Service Department

800-835-4429 or [email protected]. This limited lifetime warranty applies only to parts manufactured by DuraVent.

DuraVent provides the following warranties for its products:

One Hundred Percent (100%) MSRP 15 years from the date of purchase, and Fifty Percent (50%) thereafter, except for the following limitations on: all Termination Caps and DuraBlack® are warranted at One Hundred Percent (100%) for five years.

FasNSeal®, FasNSeal® W2, FasNSeal® Flex, and PolyPro®, and

DuraVent’s relining products including DuraLiner®, DuraFlex®

(SW, Pro, 316, 304), and Ventinox®. For purposes of this warranty, a trained professional installer is defined as one of the following: licensed contractors with prior chimney installation experience, CSIA Certified Chimney Sweeps, NFI

Certified Specialists, or WETT Certified Professionals.

All warranty obligations of DuraVent shall be limited to repair or replacement of the defective product pursuant to the terms and conditions applicable to each product line. These remedies shall constitute DuraVent’s sole obligation and sole remedy under this warranty. This warranty provides no cash surrender value. The terms and conditions of this warranty may not be modified, altered or waived by any action, inaction or representation, whether oral or in writing, except upon the express, written authority of an executive officer of

DuraVent.

Corn, bio-fuels, driftwood or other wood containing salt, preservative-treated lumber, plastic and household trash or garbage, or wood pellets containing such materials must not be burned in the appliance or fireplace. In case of a chimney fire, the chimney must be inspected and approved by a certified Chimney Sweep before reuse. After each annual inspection, maintenance, and cleaning, the certified Chimney

Sweep must fill out and date the appropriate section of the warranty card provided with the chimney liner.

LIMITATIONS ON INTERNET SALES: Notwithstanding any other terms or conditions of this Limited Lifetime

Warranty, DuraVent provides no warranty for the following specific products if such products are not installed by a qualified professional installer: DuraTech®, DuraTech®

DTC, DuraPlus HTC®, DuraTech® Premium, DuraChimney®

II, DuraPlus Canada 2, PelletVent Pro®, DirectVent Pro®,

REV 05.03.18

DuraVent must be notified and given the opportunity to inspect defective product prior to replacement under the terms of this limited lifetime warranty. All warranty claims must be submitted with proof of purchase. Labor and installation costs are not covered under this warranty. To obtain warranty service contact: DuraVent Warranty Service,

877 Cotting Ct., Vacaville CA 95688, or call 800-835-4429.

WHERE LAWFUL, DURAVENT DISCLAIMS ALL OTHER

WARRANTIES, INCLUDING BUT NOT LIMITED TO IMPLIED

WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE. IN NO EVENT WILL DURAVENT BE

LIABLE FOR INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR

SPECIAL DAMAGES OR DIRECT OR INDIRECT LOSS OF ANY

KIND, INCLUDING BUT NOT LIMITED TO PROPERTY DAMAGE

AND PERSONAL INJURY. DURAVENT’S ENTIRE LIABILITY

IS LIMITED TO THE PURCHASE PRICE OF THIS PRODUCT.

SOME STATES DO NOT ALLOW LIMITATIONS ON IMPLIED

WARRANTIES, OR THE EXCLUSION OR LIMITATION OF

INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE

LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU.

THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS,

AND YOU MAY ALSO HAVE OTHER RIGHTS THAT VARY FROM

STATE TO STATE.

For the most up-to-date installation instructions, see www. duravent.com

www.duravent.com | 800-835-4429 L209_ 810007492_DV Limited Lifetime Warranty_08-2020

L205 464002189 REV.03 06/2022 Install Instructions_Model BV_Type_B_Gas_Vent_(3” to 30”)

DuraVent Type B Gas Vent Installation Instructions

Installation Instructions MODEL

BV

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:

Keep these instructions for future reference.

Dear Customer, Installer, or End User:

TYPE B GAS VENT INSTALLATION

INSTRUCTIONS

CONTENTS

CERTIFICATION LABELS

SECTION 1

WARNING

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