DuraVent Model BV Oval Increaser: step from 4 inch to 5 inch oval
The DuraVent Model BV 4 Inch Oval Increaser to 5 Inch is a fitting that widens an oval gas vent run. It goes above a 4 inch outlet where vent sizing rules call for a 5 inch vent. This is DuraVent’s only oval increaser, with no 5 to 6 inch version. 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. It serves appliances approved for Type B vent and burning natural gas or propane.
Oval vent is flattened to fit inside a stud wall, often above a gas wall furnace. The 4 inch vent fits a 2 by 4 wall. The 5 inch vent fits a 2 by 4 or 2 by 6 wall. Those sizes describe flow equal to round pipe, not the oval’s width. Plan to change this 5 inch run to round above the last ceiling, since DuraVent’s oval roof flashing only fits 4 inch vent. Need that transition? See the DuraVent Model BV Oval to Round Adapter fitting. The DuraVent Model BV 4 Inch Oval Increaser to 5 Inch ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 4BVOX5
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
Listings
UL Listed to UL 441 and CAN/ULC-S605 (MH2848 and MH17667).