DuraVent Model BV Oval Vent Kit: the wall furnace vent’s in wall parts in one box
The DuraVent Model BV Oval Vent Kit is a set of 4 inch oval vent parts for the run inside a wall above a gas wall furnace. It includes two 24 inch pipe lengths, a base plate, two ceiling plate spacers, and an adapter that changes the oval connection to round. You get 4 feet of oval pipe, with round Model BV continuing above the wall. 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 pipe has an aluminum inside wall and a galvanized steel outside wall, with air between them. Its joining sleeve presses into place one side at a time. A screwdriver can ease the connection apart without damage. Buy the round pipe, roof flashing, storm collar, and cap separately. Any firestop spacer needed above the first ceiling, which separates the opening from the floor above, is also separate. Only need the plates? See the DuraVent Model BV Oval Installation Kit with three plates. The DuraVent Model BV Oval Vent Kit ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 4BVO-VK
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).
FAQ
What is included in the Model BV Oval Vent Kit?
Two 24-inch lengths of 4-inch oval Type B gas vent, one Oval Base Plate, two Oval Ceiling Spacers and an Oval-to-Round Adapter. That is the in-wall portion of a wall-furnace vent: 4 feet of oval pipe with its support and firestops, and the adapter that lets round Model BV continue from the top of the wall. It is available in the USA only.
Which appliances is this kit for?
Natural gas or propane Category I appliances with a draft hood or listed for Type B gas vent, typically a wall furnace or a gas space heater vented up inside a 2 x 4 or 2 x 6 stud wall. It is not for wood, pellet or condensing appliances. The furnace manual should name Type B oval vent and give the vent size; 4-inch is this kit’s size.
How tall does a wall-furnace vent have to be?
DuraVent requires a minimum of 12 feet from the bottom of a wall furnace to the cap when oval vent is used, and at least 5 feet of vent above any appliance draft hood in general, with the appliance manual and the fuel gas code setting the final height. The 4 feet of oval pipe in this kit covers the wall; round Model BV lengths make up the rest above the adapter.
What clearance and firestopping apply?
Keep 1 inch of air space to combustibles; the base plate and ceiling spacers hold that spacing and firestop each ceiling the vent passes. Never fill the gap with insulation and use an attic insulation shield where the round vent crosses an attic. The ovals are aluminum inside and galvanized outside with a 1/4-inch air space, listed to UL 441.
What do I still need to finish the run?
Round Model BV pipe from the Oval-to-Round Adapter to the roof, a flashing for the roof pitch, a storm collar and a DuraCap, all in the Model BV category; the Roof Top Term Kit bundles the top parts. Oval lengths button-lock together and the draft hood connector attaches to the furnace with three sheet metal screws.