Model BV

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

• 3″- 30″ Round Diameter.
• 4″, 5″ and 6″ Oval (USA only)

Listings
UL Listed to UL 441 and CAN/ULC-S605 (MH2848 and MH17667).