DuraVent - 7" Length Large Diameter Increaser Type B Gas Vent

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DuraVentSKU: 6BVX12

Sale price$961.75 Regular price$1,202.19
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Size: 6"x12"

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Elevate your gas venting system with DuraVent's 7" Length Large Diameter Increaser. At DuraVent, we've built our reputation as the industry leader in venting solutions, offering products that stand out for their innovation, safety, and professional quality. Our Type B Gas Vent system, featuring the revolutionary DuraLock connection, guarantees a secure, airtight fit that ensures optimal performance and reliability.


  • Enhanced Efficiency: DuraVent's 7" Length Large Diameter Increaser is designed to increase the vent size by up to four sizes, optimizing the flow of gas and increasing efficiency in your system.

  • Durability: Crafted from rugged galvanized steel, our increaser boasts internal spacing beads that provide consistent insulating air space between pipe walls. This results in a robust, easy-to-connect joint that holds up over time, even in challenging conditions.

  • Safety Assured: Our double-wall construction creates a permanent insulation layer, maintaining the inner pipe's heat while keeping the outer pipe cool. This design minimizes condensation and prevents overheating of nearby surfaces, ensuring a safe environment.

  • Tested and Listed: DuraVent's Model BV and BVO Type B Gas Vent systems have undergone rigorous testing and are UL 441 listed for installation as Type B and BW gas vents. Compliant with NFPA 54 and NFPA 211 standards, they can be safely installed in both single and multi-story buildings.

  • Versatile Applications: Ideal for use with natural gas or liquid propane Category I appliances, our increaser is compatible with draft hood equipped appliances. It's perfect for a wide range of applications, including natural gas fireplaces, gas-fired furnaces, boilers, water heaters, and wall or space heating systems.

  • Premium Materials: Crafted with precision, our increaser comes in various sizes to suit your needs. It features a high-quality aluminum inner wall and a galvanized outer wall, ensuring longevity and top-notch performance.

  • Peace of Mind: Rest easy knowing that DuraVent offers a limited lifetime warranty, giving you confidence in the durability and reliability of our products.


  • The increaser is used to increase the vent size.
  • The maximum increase is 4 sizes


  • 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. 

  • Round Type B Gas Vent 10″ – 18″: Aluminum .014″ inner wall, galvanized .018″ outer wall. DuraLock® feature 10″ and larger diameters.

  • Round Type B Gas Vent 20″ – 30″: aluminum .023″ inner wall, galvanized .018″ outer wall. DuraLock® feature 10″ and larger diameters.


Model Size
6BVX12 6" x 12" I.D x 7" Length
10BVX14 10" x 14" I.D x 7" Length
10BVX16 10" x 16" I.D x 7" Length
10BVX18 10" x 18" I.D x 7" Length
12BVX14 12" x 14" I.D x 7" Length
12BVX16 12" x 16" I.D x 7" Length
12BVX18 12" x 18" I.D x 7" Length
12BVX20 12" x 20" I.D x 7" Length
14BVX16 14" x 16" I.D x 7" Length
14BVX18 14" x 18" I.D x 7" Length
14BVX20 14" x 20" I.D x 7" Length
14BVX22 14" x 22" I.D x 7" Length
16BVX18 16" x 18" I.D x 7" Length
16BVX20 16" x 20" I.D x 7" Length
16BVX22 16" x 22" I.D x 7" Length
18BVX20 18" x 20" I.D x 7" Length
18BVX22 18" x 22" I.D x 7" Length
18BVX24 18" x 24" I.D x 7" Length
18BVX26 18" x 26" I.D x 7" Length
20BVX22 20" x 22" I.D x 7" Length
20BVX24 20" x 24" I.D x 7" Length
20BVX26 20" x 26" I.D x 7" Length
20BVX28 20" x 28" I.D x 7" Length
22BVX24 22" x 24" I.D x 7" Length
22BVX26 22" x 26" I.D x 7" Length
22BVX28 22" x 28" I.D x 7" Length
22BVX30 22" x 30" I.D x 7" Length
24BVX26 24" x 26" I.D x 7" Length
24BVX28 24" x 28" I.D x 7" Length
24BVX30 24" x 30" I.D x 7" Length
26BVX28 26" x 28" I.D x 7" Length
26BVX30 26" x 30" I.D x 7" Length
28BVX30 28" x 30" I.D x 7" Length
Clearances 1" to combustibles in single and multi-family dwellings
Listings UL Listed to UL 441
Warranty Limited lifetime warranty


About the Manufacturer:

Consistently the first to market with new innovations in venting systems, DuraVent has captured a leadership position in emerging markets. DuraVent has patents for several products and continues to design safe and technologically advanced venting.The company’s research into solving problems with corrosion, when biofuels such as corn are used, led to the break-through patent for PelletVent Pro.

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Order Confirmation:

Upon placing your order, you will promptly receive an email confirmation. Subsequently, we will conduct a thorough inventory check to ensure all items are in stock and available for immediate shipment. If your order aligns with the advertised delivery timeframe, we will promptly process it for shipment to our warehouse. In cases where the expected delivery time extends beyond the advertised timeframe, we will reach out to you via email and/or phone for confirmation.

Order Shipment:

Within one business day of your item being shipped, you will receive an email confirmation containing a tracking number. If you do not receive tracking information within six business days of placing your order, please don't hesitate to get in touch with us for assistance.

Estimated Time of Arrival:

Our typical delivery timeframe ranges from 2 to 10 business days. Custom-made products generally require 3 to 5 weeks for delivery. If the expected delivery date for your order would fall outside of the advertised 2-10 business day time frame, our customer service team will contact you to ensure your agreement with the revised timeline.

Covered Areas:

Please note that all estimated delivery dates and shipping costs advertised on our website apply exclusively to the Contiguous United States. For inquiries regarding shipping to Hawaii or Alaska, kindly reach out to our customer service team. While we do not offer direct shipping to Canada, we are more than willing to ship your order to the freight carrier of your choice.


It is very important that you inspect the packaging of your items when they arrive and check if you received all boxes listed on the delivery receipt. If you notice any damage or shortage of packages, you must make note of it on the bill of lading, take pictures, and refuse delivery. Your note should say "refused due to damage". You must also take photos of all sides of the box and send them to us within 2 days. If there are no damages visible before opening the box, you must note "subject to further inspection may contain concealed damage". If you notice any damage after receiving the delivery, do not throw the box away, and contact us with the photos. After we receive information from you about the refused delivery or concealed damage, we immediately initiate a claim with the shipping company or with the manufacturer. After the claim is fully processed, we ship all replacements at absolutely no cost to you.

Cancellations & Refunds:

We offer free order cancellations before the shipping label or Bill of Lading is generated, or prior to the commencement of production for custom orders. Please note that custom-made items are not eligible for refunds once production has begun. To be eligible for a return, the item must be unused and in its original condition, with all packaging intact and in perfect condition. Orders delivered outside of the United States are not eligible for refunds. If your order arrives damaged, please refer to the "Damages" section. Our refund policy extends for 30 days. If 30 days have elapsed since your purchase, regrettably, we cannot process a refund. Prior to returning an item, please contact us to discuss shipping details. All refunds will be credited to the original credit card or PayPal account used for the purchase, within two days of receiving the returned items at our warehouse.

Please contact sales@belleflame.com for any questions regarding shipping time.

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