DuraVent Model BV Tall Cone Flat Flashing: a raised cone for flat roof vent openings
The DuraVent Model BV Tall Cone Flat Flashing is a roof cover for a gas vent passing through a flat roof. Its tall, straight cone keeps the storm collar above pooled water and snow. The collar is separate. Choose a 3 to 8 inch diameter to match your vent. The base is nailed on all four sides, with its top and sides under the roofing and its bottom over it. Silicone seals the edges. 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.
Multiple gas appliances can share a vent through a tee, reduction tee, or wye, with an increaser joining a smaller connector to the larger vent. A tee starting a vertical vent gets a bottom cap to keep air out. Every 3 to 8 inch part needs 1 inch of open air around it, clear of framing, drywall, roofing, wires, and insulation. Vertical vents through occupied rooms need an enclosure that preserves that space. Have a pitched roof? See the DuraVent Model BV Tall Cone Adjustable Roof Flashing. The DuraVent Model BV Tall Cone Flat Flashing ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 3BVFF | 4BVFF | 5BVFF | 6BVFF | 7BVFF | 8BVFF
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).