DuraVent Model BV – Roof Top Term Kit

$138.00

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DuraVent Model BV Roof Top Termination Kit: four parts for both ends of your gas vent

The DuraVent Model BV Roof Top Termination Kit is a four part kit for a gas vent running straight up through the roof. You get the DuraCap for the top, adjustable roof flashing, a storm collar that fits around the pipe, and a draft hood connector for the appliance end. Pipe is not included. The flashing fits roof slopes from flat to 6 in 12. A steeper roof needs different flashing. 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 a 3, 4, 5, or 6 inch size on this page. Vent diameter comes from the appliance instructions and fuel gas sizing tables, not from DuraVent. Buy pipe lengths, firestops, supports, and an attic shield separately. DuraVent requires at least 5 feet of vent above the appliance draft hood, with more height for a run with bends or two appliances. Only need the top cap? See the DuraVent Model BV DuraCap vent cap. The DuraVent Model BV Roof Top Termination Kit ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.

Details

SKU: 3BVK | 4BVK | 5BVK | 6BVK

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).

Instructions

Typical Installation

Small Diameter – Vertical Installations

SmallDiameterVent2.0-scaled_
Item Clearance - See Note 1 Max Height Outer Tube Ø Materials Locking Device UL Listing
Type B Vent Round 3″-8″ (USA) 1 inch 100 feet 1/2″ larger than ID Inner – .012″ Aluminum Outer – .018″ Galvanized DuraLock & DuraTab MH2848
Type B Vent Round 3″-8″ (CAN) 1 inch 100 feet 1/2″ larger than ID Inner – .012″ Aluminum Outer – .018″ Galvalume* DuraLock & DuraTab MH2848
Round 10" to 18" - See note 2 1 inch 100 feet 1″ larger than ID Inner – .014″ Aluminum Outer – .018″ Galvanized DuraLock MH2848
Round 20″ to 30″ (USA) See note 2 1 inch 100 feet 1″ larger than ID Inner – .023″ Aluminum Outer – .018″ Galvanized DuraLock MH2848
Round 20″ to 24″ (CAN) See note 2 1 inch 100 feet 1″ larger than ID Inner – .023″ Aluminum Outer – .018″ Galvanized DuraLock MH2848
Round 26″ to 30″ (CAN) See note 2 2 inch 100 feet 1″ larger than ID Inner – .023″ Aluminum Outer – .018″ Galvanized DuraLock MH2848
Oval Type B Gas Vent 4″ and 5″ 1 inch - See Note 5 See Note 3 4": 2 1/2″ x 7 1/4″ or 5": 3 1/8″ x 10 7/8″ Inner – .012″ Aluminum Outer – .018″ Galvanized DuraLock MH2848
Oval Type B Vent 6″ 1 inch - See Note 5 See Note 3 3 1/4″ x 12″ Inner – .012″ Aluminum Outer – .018″ Galvanized DuraLock MH2848
DuraConnect I Flex 3″ and 4″ 1 inch See Note 4 NA .012″ Aluminum Flexible .018″ Galvalume Fittings DuraLock & DuraTab MH17667
DuraConnect II Flex 3″ to 5″ 1 inch See Note 4 1/4″ larger than ID .006″ 2 Ply Aluminum Flex .018″ Galvalume Fittings DuraLock & DuraTab MH17667

 

*In Canada, the outer tube material is galvalume for 3″ to 8″ pipe length. All other 3″ to 8″ fittings have a galvanized outer tube.

Notes: Gas Vent Specification Chart

  1. Clearance to combustibles is the air space between vent and combustibles.
  2. For maximum height refer to the appliance manufacturer installation instructions and the National Fuel Gas Code NFPA 54 or the Canadian Fuel Gas Installation Code CSA-149.1-00. For taller applications refer to Duravent Sizing Handbook.
  3. When oval is used on wall furnaces, minimum height required from bottom of furnace to cap is 12′, minimum 16″ stud space.
  4. Limited by sizing tables.
  5. BVO 4″ & 5″ oval can be installed in a 2″ x 4″or a 2″ x 6″ stud wall. BVO 6″ oval can be installed in a 2″ x 6″ stud wall.

Product Resources

Catalogs

Bulletins

Sales Sheets

Spec Sheets

Videos

Model BV Installation Video – English

https://youtu.be/4BZdKJimAG0?si=AGyqfm812eqg_0Mj

Universal Vent Cap

https://youtu.be/oRiAnyoFY50?si=IL3qoQb622fYxvHY

Duravent DuraCap

https://youtu.be/PwqzgOc2ScA?si=5ZmsWIog7XEm2jc8

FAQ

What is in the Model BV Roof Top Term Kit, and which size should I pick?

The kit includes a DuraCap, a flashing for flat to 6/12 roofs, a Storm Collar and a Draft Hood Connector; no pipe lengths. Pick the diameter (3, 4, 5 or 6 inch) on the selector above to match the appliance draft hood or flue collar; the 3-inch is the base listing and the larger sizes show their price there. Never size the vent smaller than the outlet.

Which appliances is Type B gas vent for?

Model BV is a Type B gas vent for natural gas or propane Category I and draft-hood-equipped appliances: gas furnaces, boilers, water heaters, wall or space heaters and gas fireplaces listed for Type B vent. It is not for wood stoves, pellet stoves or any appliance whose manual calls for a different vent type, so check the rating plate first.

What clearance to combustibles does Model BV need?

The 3 to 8 inch round vent is listed for 1 inch of air space to combustibles in the USA (1 inch in Canada up to 24 inch diameters). That air space must stay open: do not fill it with insulation, and use the firestop spacer at each ceiling and an Attic Insulation Shield in an attic to keep loose insulation off the pipe.

How tall does the vent have to be, and does this flashing fit my roof?

DuraVent requires at least 5 feet of vent height above the appliance draft hood, and more when the vent has an offset or serves more than one appliance, per the appliance instructions and the fuel gas code. The included flashing suits pitches from flat to 6/12; a steeper roof needs a different flashing. Any vent extending more than 5 feet above the roof must be guyed or braced.

How do the pieces connect?

Model BV lengths lock together with DuraVent’s DuraLock and DuraTab twist connection, so screws are not required on pipe joints. The Draft Hood Connector attaches to the appliance outlet with three sheet metal screws, the flashing nails to the roof with the upper flange under the roofing, and the Storm Collar is screwed to the pipe with the screw heads sealed with silicone.

What do I need where the vent passes through ceilings and the attic?

Every ceiling or floor the vent passes through must be firestopped with a Firestop Spacer or a Firestop Support Plate, which can also carry the vent’s weight. In an attic use an Attic Insulation Shield. Those parts are not in this kit, which covers only the roof-top termination and the appliance end, so add them with the Model BV pipe lengths.

Shipping / Freight / Return Info

Same-Day / 24 hour shipping

Same-Day/24 hour shipping - If we have the product in stock, we can ship same day if ordered before 12pm Monday - Friday (CST).

Freight Claims Policy

Please follow these very important steps when it comes to Freight Items that are damaged or missing
  • Open and inspect the order while the delivery driver is present. If delivery driver does not provide sufficient time to do so, please notate the delivery receipt.
  • By signing the delivery receipt without noting any damage or missing items, you confirm that your order arrived complete and in excellent condition.
  • Record any damage or missing pieces directly on the delivery receipt.
  • Do not discard damaged item(s) or any original packaging. For severe damage, write “Refused due to damage” on the delivery receipt and contact us immediately.
  • Report any damage within two business days, including delivery details and photos showing the issue
  • Damaged item(s) must be returned within 30 days. Failure to return them will result in a charge to the original payment method.

Return Merchandise Authorization Policy

Please follow these very important steps when Returning Items. Contact our team.
  • Submit your return request within 30 days of delivery.
  • You will receive an email within 1-2 business days confirming whether your return request has been approved or denied.
  • Please also note that a 20% restocking fee may apply to approved returns
  • If approved, you will receive an itemized Return Authorization, return shipping labels (if requested), and detailed instructions within 1–2 business days
  • From the date this email is received, you will have 14 days to return the product.
  • Once our distributor receives and inspects the returned item(s), your refund will be issued within 1–2 weeks
  • Items returned outside of this process or time frame are not eligible for a refund.

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