DuraVent Model BV Oval Storm Collar: keeps rain out above the oval roof flashing
The DuraVent Model BV Oval Storm Collar is a rain collar for a 4 inch oval gas vent at the roof. It sits on top of the flashing, the piece that covers the roof opening around the pipe. Mastic, a sealing compound, seals the collar to the pipe to keep rain from getting between them. The collar comes separately, not included with any flashing. 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.
Above the last ceiling, the vent can continue in oval or change to round with an oval to round adapter. DuraVent notes that round flashings, caps, and fittings cost less. The oval flashing only fits 4 inch vent and roofs from flat to 5 in 12. A 5 or 6 inch oval run, or a run through a steeper roof, must finish in round instead. Need the roof piece beneath this collar? See the DuraVent Model BV Oval Adjustable Roof Flashing. The DuraVent Model BV Oval Storm Collar ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 4BVOSC
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).