DuraVent Model BV Oval Top: a rain cap for a 4 inch oval roof exit
The DuraVent Model BV Oval Top is a cap for a 4 inch oval gas vent that stays oval above the roof. It keeps rain and debris out of the vent. This top fits only the 4 inch size. 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. The oval version is flattened to fit inside a stud wall, often above a gas wall furnace. It serves natural gas or propane appliances listed for Type B vent.
Above the last ceiling, the vent can remain oval or change to round with an adapter. The oval roof flashing, which covers the opening around the vent, comes only in 4 inch and fits roofs from flat to 5 in 12. A larger oval run or a steeper roof needs a round finish. DuraVent says round flashings, caps, and fittings cost less. Finishing a 5 or 6 inch oval run? Use the DuraVent Model BV Oval to Round Adapter to connect to a round Model BV cap. The DuraVent Model BV Oval Top ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 4BVOVT
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).