Type B Gas Vent Type B Gas Vent Type B gas venting system. UL 441 and ULC S605. DuraFlex® AL Aluminum flexible relining UL 1777 & ULC S635.
Specifications UL 441 and ULC S605 System Applications DuraVent’s Type B Gas Vent system. Use with natural gas or liquid propane category I and draft hood equipped appliances, and appliances tested and listed to use Type B Gas Vent. Applications include: natural gas fireplaces, gas-fired furnaces, boilers, water heaters, and wall or space heating applications. Type B Gas Vent Materials and Construction Round Type B Gas Vent 3” - 8” and oval 4” - 6”: Aluminum .012” inner wall, galvanized .
c-UL-us 441 System Specifications DuraConnect II DuraConnect II Materials and Construction .010” Double-wall aluminum flex inner wall (two-ply .005”), .018” galvalume outer wall, with twist-lock connections. Double-wall connector pipe, UL approved as a Type B Gas Vent segment, for use in conditioned and unconditioned attics and crawl spaces. (Not to be enclosed and cannot penetrate through walls, floors, or ceilings.
What makes us different from the rest? DuraVent’s Type B Gas Vent: A completely engineered system. No sharp tabs to bend into slots. Twist locks into place. Designed to meet the rugged demands of the job site with a recessed inner wall Innovative system for a firm, locktight connection Remains hot during operation with minimal condensation Engineered to heat-up rapidly.
Round Gas Vent | Type B Gas Vent Typical Installations Installation Key 1 1 3 2 3 2 18 24 17 22 13 10 25 6 20 5 22 6 19 5 15 21 15 Furnace To Oval Type B Gas Vent Furnace To Masonry 1 14 Increaser 2 Storm Collar 15 Draft Hood Connector 3 Roof Flashing 16 Square Firestop Support 4 High-Wind Cap 17 Oval Pipe 5 Round Pipe 18 Oval to Round Adapter 6 Elbow 19 Oval Tee 7 Tee 20 Oval Tee Cap 8 Tee Cap 21 Oval Tee Support 9 Increaser Tee 22 Oval Firestop Space
Type B Gas Vent | Round Gas Vent How Size and Height Affect Stove Performance • The amount of heat the vent gases lose as they flow determines how much condensation will occur and how strong the draft will be. To control the heat loses, proper selection of venting materials is of vital importance. • Double-wall Type B Gas Vent, with an aluminum inner wall and a galvanized steel outer wall, has proven to be the ideal choice in venting materials.
Round Gas Vent | Type B Gas Vent Round Type B Gas Vent Round Rigid Pipe Use for venting listed natural gas or liquid propane Category I, draft hood appliances, or appliances that have been specifically tested and listed to use Type B Gas Vent. The appliances listed typically use Type B Gas Vent systems, but not always: Furnaces, Water Heaters, Boilers, Room Heaters, Decorative Gas Appliances, and Unit Heaters. Length To calculate installed length, subtract 1 1⁄2” from each connection of vent.
Type B Gas Vent | Round Gas Vent Large Diameter Round Rigid Pipe Length 10”- 16” Length 18”-30” Type B Gas Vent systems may be used on other gas-burning appliances, when specified by appliance manufacturer. Type B Gas Vent is not used for Category II, III, or IV gas appliances, unless specified by appliance manufacturer. Flex Pipe To calculate installed length, subtract 1 1⁄2” (for 10”-16” diameter) and 1 1⁄8” (for 18”-30” diameter) from each connection of vent.
Round Gas Vent | Type B Gas Vent Round Adjustable Pipe Use to add length to a straight length of Type B Gas Vent. 12” adds 3”-10” of length, 18” adds 10”-16” of length. Requires a 2” overlap.
Type B Gas Vent | Round Gas Vent 90° Adjustable Elbow Offsets obstructions as needed. Elbows (3”-8”) swivel 360° at base. 90° Elbow is adjustable from 0° to 90° in sizes 3”-10”. Elbows must be supported when installed. A B 3”- 8” 90 Adjustable Elbow W/ Swivel Base 45°/60° Adjustable Elbow A B 3”- 8” 45 to 60 Adjustable Elbow W/ Swivel Base 45° Elbow A B 10”-16” 45 Adjustable Elbow Y X 90° offset using two 45° Elbows (2) 45 elbows to make a 90 211 DuraVent | www.duravent.
Round Gas Vent | Type B Gas Vent Standard Tee Use for a 90° offset or to combine connectors from two or more appliances into a common vent. Branch swivels for alignment. 3”-8” feature swivel on male end.
Type B Gas Vent | Round Gas Vent Double-Wall Wye - 45º Branch Use to combine connectors from two or more appliances into a common vent. Branch swivels for alignment. Swivel on male end. Additional sizes available through special order.
Round Gas Vent | Type B Gas Vent Increaser Use to increase vent diameter. Additional sizes available through special order. **Specified diameter (i.e.: 6GVX10).
Type B Gas Vent | Round Gas Vent Male Adapter Use to connect existing DuraVent Type B Gas Vent to a listed Type B Gas Vent system manufactured by other companies. Male adapter can also be used to attach to DuraFlex AL.
Round Gas Vent | Type B Gas Vent Square Firestop Support Use to support vent at ceiling level. Includes clamp that supports and prevents pipe sections from slipping down. Provides the mandatory 1” clearance to combustibles. Straps extend 16”.
Type B Gas Vent | Round Gas Vent Round Bucket Support 14¼ to 22¼ A Use to support the Type B gas vent between 16” to 24” on-center joists or rafters. Use with a Draft Hood Connector to transition fitting between single-wall connector and Type B gas vent pipe sections. A Firestop Spacer is required. SIZE ORDER # STOCK # 3”- 4” A 3GVRS4 810002524 7” 5”- 6” 5GVRS6 810002619 8” 7”- 8” 7GVRS8 810002704 10” Round Bucket Support Pipe Collar Use for decorative purposes. Optional.
Round Gas Vent | Type B Gas Vent Storm Collar Use to maintain a weather tight resistant seal between the pipe and the flashing.
Type B Gas Vent | Round Gas Vent Steep Roof Flashing Use to weather proof the penetration of vent pipe through the roof. Storm Collar required. Select roof flashing based on pitch of roof. For pitches of 7/12 - 12/12. Made of galvalume.
Round Gas Vent | Type B Gas Vent DSA Roof Flashing C A B DuraCap B 3”- 8” Dura Cap High-Wind Cap ORDER # STOCK # A B C 3” 3GVFDSA 810002533 3 5⁄8” 19 3⁄8” 23” 4” 4GVFDSA 810002578 4 5⁄8” 19 3⁄8” 23” 5” 5GVFDSA 810002627 5 5⁄8” 22” 24 13⁄16” 6” 6GVFDSA 810002674 6 3⁄4” 22” 24 13⁄16” B 3”- 8” A SIZE ORDER # STOCK # A B 3” 3GVDC 810002534 8” 5” 4” 4GVDC 810002579 8” 5” 5” 5GVDC 810002628 11” 7 1⁄2” 6” 6GVDC 810002675 11” 7 1⁄2” 7” 7GVDC 810002711
Type B Gas Vent | Oval Gas Vent Oval Type B Gas Vent Oval Installation Kit Kit includes: Oval Base Plate and (2) Oval Ceiling Plate Spacers. Use for wall furnaces installed in a single-story application. Oval Rigid Pipe B A SIZE ORDER # STOCK # 4” 4GVO-K 810002879 Use for venting listed natural gas or liquid propane Category I, draft hood appliances, or appliances that have been specifically tested and listed to use Type B Gas Vent.
Oval Gas Vent | Type B Gas Vent Oval Adjustable Pipe Use to add length to a straight length of Oval Type B Gas Vent Pipe. Adjusts from 4”-10”. Requires a 2” overlap. SIZE LENGTH ORDER # STOCK # 4” 12” 4GW12A 810002887 5” 12” 5GW12A 810002913 6” 12” 6GW12A 810002937 12” Adjustable Oval Pipe Oval Increaser Use to increase oval vent diameter.
Type B Gas Vent | Oval Gas Vent Oval 45° Elbow - Standard Offsets obstructions as needed. Not adjustable. B SIZE ORDER # STOCK # A B 4” 4GWL45 810002892 3 5⁄8” 3 1⁄2” 5” 5GWL45 810002917 4 1⁄8” 5” 6” 6GWL45 810002941 5” 5” A Standard Oval 45° Elbow - Flat Offsets obstructions as needed. Not adjustable.
Oval Gas Vent | Type B Gas Vent Oval Firestop Spacer Use to center oval vent in a minimum 16” on-center stud space. Serves as a firestop at the ceiling level. Required in multi-story installations. 14¼” A SIZE 17½” ORDER # STOCK # A 4” 4GWFS 810002895 7 1⁄2” 4” 4GWFS2X6 810002896 7 1⁄2” 5” 5GWFS 810002920 11” 5” 5GWFS2X6 810002921 11” Oval Firestop Spacer Oval Base Plate Use to attach oval vent to a wall furnace.
Type B Gas Vent | Oval Gas Vent Oval Increaser Tee Use to attach smaller round pipe to larger oval pipe. Use for a 90° offset or to combine connectors from two or more appliances into a common vent. D A B C Standard Tee & Increaser Tee A Oval Tee Cap SIZE ORDER # STOCK # A B C D 4” x 3” 4GWTR3 810002900 10 1⁄8” 5” x 3” 5GWTR3 810002923 11 7⁄8” 3” 5” 6 1⁄2” 3” 6 1⁄4” 7 1⁄4” 5” x 4” 5GWTR4 810002924 11 7⁄8” 4” 6 1⁄4” 6 3⁄4” Use to close off bottom of Oval Tee.
Oval Gas Vent | Type B Gas Vent Oval DSA Roof Flashing Use with metal or tile roofs. Available in Adjustable Roof Flashing style (0/12-6/12). Made of dead soft aluminum. Refer to Roof Flashing tables for dimensions. B C A Oval Flashing Oval Cap B C A SIZE ORDER # STOCK # A B C 4” 4GWFDSA 5” 5GWFDSA 810002904 3 3⁄4” 28 1⁄2” 23 1⁄2” 810002928 3 1⁄2” 30 1⁄2” 27” 6” 6GWFDSA 810002951 7” 35” 27” Required where pipe terminates above the roof line.
Type B Gas Vent | Oval Gas Vent DuraFlex® - Aluminum Need An Air Intake Solution? Create Your Own Kit Order Diameter DuraFlex AL length, Hanger Bracket, Coupler and Wall Plate for Twin Pipe. (2" Air intake will require a 2"-3" Increaser: 2PPS-X3) • (1) DuraFlex AL Length: DFA-25, DFA-35, or DFA-50 • (1) Hanger Bracket: DFA-FCB • (1) Coupler: DFA-FCP • (1) Wall Plate for Twin Pipe: PPS-WPT DuraFlex AL Kit Kit includes: DuraFlex AL Length, DuraFlex AL Cap, DuraFlex Top Plate, and DuraFlex Mortar Sleeve.
DuraFlex AL | Type B Gas Vent Coupler Use to connect DuraFlex AL lengths to PolyPro. To be used in combustion air only. PPS-PAC may be used to secure connection. SIZE ORDER # STOCK # 3” 3DFA-FCP 4DFA-FCP 810004452 810004435 4” Hanger Bracket Use to secure and hang DuraFlex AL lengths from top of enclosure. To be used on combustion air only. Must be used with FCT Chimney Cap or FK Lining Kit.
Type B Gas Vent | DuraFlex AL DuraFlex AL Top Plate Use to seal the top of the masonry chimney.
DuraFlex AL | Type B Gas Vent Universal B-Vent to Aluminum Flex Adapter Use to connect DuraFlex AL flex to any brand of B-vent. SIZE ORDER # STOCK # SIZE ORDER # STOCK # 3” 3DFA-ADBV 4DFA-ADBV 5DFA-ADBV 810007024 810007025 810007026 6” 7” 6DFA-ADBV 7DFA-ADBV 8DFA-ADBV 810007027 810007028 810007029 4” 5” DuraFlex Mortar Sleeve ØA Use to protect DuraFlex when passing length through a masonry wall.
Type B Gas Vent | DuraFlex AL Unit Heater Kit Vertical Unit Heater Kit Use to vertically vent unit heaters. Call for pricing. 3” kit includes 12” and 24” Pipe Lengths, 90° Elbow, Draft Hood Connector, Adjustable Flashing, Storm Collar, and DuraCap. 4” kit includes 12” and 24” Pipe Lengths, 90° Elbow, 4” Diameter Draft Hood Connector, 3” Draft Hood Connector, 3”-4” Increaser, Adjustable Flashing, Storm Collar, and DuraCap.
