DuraVent Model BV Attic Insulation Shield: keeps attic insulation away from the vent pipe
The DuraVent Model BV Attic Insulation Shield is a sleeve that surrounds the gas vent where it enters the attic. DuraVent requires it for 3 to 8 inch Model BV runs to keep insulation and debris off the pipe. Its height adjusts from 11 to 20 inches so the top can sit above the insulation. 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 shield that matches your vent size: 3 to 4, 5 to 6, or 7 to 8 inch.
These vent parts need 1 inch of open air space around them, away from anything that can burn, including wood, drywall, wires, and insulation. Through occupied rooms, the upright vent is enclosed in a box that preserves that space. If the attic roof leaves too little room for the shield, the vent is boxed in to the roof deck instead, with a firestop spacer at the ceiling. Need that ceiling plate? See the DuraVent Model BV Gas Vent Firestop Spacer plate. The DuraVent Model BV Attic Insulation Shield ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 3BVIS | 5BVIS | 7BVIS
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).