DuraVent - 4"-8" Inner Diameter Reducer Type B Gas Vent

Save $16.01
DuraVentSKU: 4BVR3

Regular price$64.05 Sale price$80.06

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Size: 4"
⛟ Estimated Delivery Date: Between and to all states excl. Alaska & Hawaii.

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When it comes to venting solutions, DuraVent stands as the paragon of excellence in the industry. With an unwavering commitment to innovation, safety, and professionalism, DuraVent has solidified its position as the trusted choice for HVAC and Hearth markets. Now, we introduce the DuraVent 4"-8" Inner Diameter Reducer Type B Gas Vent - a testament to our unwavering dedication to quality.

At the heart of this product lies our revolutionary DuraLock technology. With alignment indicators that meet seamlessly, a tactile 'snap' that signifies a secure connection, and ends that clasp together with confidence, DuraLock ensures a lock-tight connection that brings peace of mind to homeowners and professionals alike. This innovative system sets the industry standard, assuring you of unmatched safety and reliability.


  • Rugged Construction: Crafted from robust galvanized steel, our venting system boasts internal spacing beads, guaranteeing a uniform insulating air space between pipe walls. The die-formed ends provide uniform sizing, making joints strong and effortlessly connectable. In Canada, we offer lengths in galvalume steel outer pipe, showcasing our commitment to versatility.

  • Assured Safety: The double wall construction, featuring a pipe within a pipe, creates a built-in air space that offers permanent insulation. This design keeps the inner pipe hot while ensuring the outer pipe remains relatively cool. The result? Quick, powerful vent action that reduces condensation within the pipe and prevents overheating of nearby enclosure surfaces.

  • Fully Tested and Listed: DuraVent's Model BV and BVO Type B Gas Vent have undergone rigorous testing and have received UL 441 certification for installation as Type B and BW gas vents. This certification assures compatibility with single and multi-story buildings, in compliance with the standards of NFPA 54 and NFPA 211.

  • Applications: DuraVent's Type B Gas Vent system is compatible with natural gas or liquid propane Category I appliances, as well as draft hood-equipped appliances. It's your go-to solution for a wide range of applications, including natural gas fireplaces, gas-fired furnaces, boilers, water heaters, and wall or space heating applications.

  • Materials and Construction: Our venting system comes in various sizes and materials to cater to your specific needs. From aluminum inner walls to galvanized outer walls, we offer durability and reliability in every dimension, ensuring your system performs optimally.

  • Specifications: Choose from a range of sizes, including 4" x 3", 5" x 4", 6" x 5", 7" x 6", and 8" x 7". With clearances of just 1" to combustibles in single and multi-family dwellings and UL Listing to UL 441, our product ticks all the boxes for safety and compliance. Plus, enjoy the peace of mind that comes with our limited lifetime warranty.


  • One step only
  • For USA only


Model STEP
4BVR3 4" x 3"
5BVR4 5" x 4"
6BVR5 6" x 5"
7BVR6 7" x 6"
8BVR4 8" x 7"
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.

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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