DuraVent Model BV Large Diameter Increaser: a step up to a larger vent size
The DuraVent Model BV Large Diameter Increaser is a fitting that joins a smaller vent section to a larger one. The combinations on this page start with a 4 inch outlet feeding a 10 inch vent and go up to 28 inch feeding 30 inch. Each increaser can step up no more than four vent sizes. For example, a 10 inch vent can increase to 18 inch with one fitting. Model BV is DuraVent’s Type B gas vent, the double wall pipe that carries the exhaust from a gas furnace, boiler, or water heater out of the house.
Choose the smaller connection size first, then the larger size you need it to meet. These choices describe the two ends of the fitting, not its length. For 10 to 18 inch vent, the run begins with a draft hood connector, the part screwed to the appliance outlet. The vent must extend at least 5 feet above the draft hood. Joining an 8 inch run to a 10 inch vent another way? See the DuraVent Model BV Adjustable Reduction Tee fitting. The DuraVent Model BV Large Diameter Increaser ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 3BV06 | 3BV06C | 3BV12 | 3BV12C | 3BV18 | 3BV18C | 3BV24 | 3BV36 | 3BV36C | 3BV48 | 3BV48C | 3BV60 | 3BV60C
SKU: 4BV06 | 4BV06C | 4BV12 | 4BV12C | 4BV18 | 4BV18C | 4BV24 | 4BV36 | 4BV36C | 4BV48 | 4BV48C | 4BV60 | 4BV60C
SKU: 5BV06 | 5BV06C | 5BV12 | 5BV12C | 5BV18 | 5BV18C | 5BV24 | 5BV36 | 5BV36C | 5BV48 | 5BV48C | 5BV60 | 5BV60C
SKU: 6BV06 | 6BV06C | 6BV12 | 6BV12C | 6BV18 | 6BV18C | 6BV24 | 6BV36 | 6BV36C | 6BV48 | 6BV48C | 6BV60 | 6BV60C
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.
Materials and Construction
Round Type B Gas Vent 3″ – 8″ and Oval 4″ – 6″: Aluminum .012″ inner wall, galvanized .018″ outer wall, in Canada, the lengths have a galvalume .018″ outer wall. The 3″ – 8″ Round gas vent features DuraLock® and DuraTab® . The Oval gas vent features the button lock.
Round Type B Gas Vent 10″ – 18″: Aluminum .014″ inner wall, galvanized .018″ outer wall. DuraLock® feature for 10″ and larger diameters.
Round Type B Gas Vent 20″ – 30″: aluminum .023″ inner wall, galvanized .018″ outer wall. DuraLock® feature for 10″ and larger diameters.
Clearances
Clearances to combustible materials in single and multi-family dwellings:
- 1″ Clearance – USA – 3″ to 30″
- 1″ Clearance – Canada – 3″ to 24″
- 2″ Clearance – Canada – 26″ to 30″
Annular insulating air space
- 3″ – 8″ Round Vent: 1/4″ air space
- 4″ – 6″ Oval Vent: 1/4″ air space
- 10″ – 30″ Round Vent: 1/2″ air space
Diameters
- 3″- 30″ Round Diameter.
- 4″, 5″ and 6″ Oval (USA only)
Listings
UL Listed to UL 441 and CAN/ULC-S605 (MH2848 and MH17667).