DuraVent | DuraFlex AL Coupler 3"-4" Inner Diameter Type B Gas Vent

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Sale price$54.88 Regular price$68.59
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Size: 3"

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In the ever-evolving world of HVAC, where innovation meets necessity, one name stands tall - DuraVent. Our commitment to excellence has made us the undisputed leader in the venting industry. Today, we proudly introduce the DuraVent DuraFlex AL Coupler Type B Gas Vent - a revolutionary solution designed to elevate your heating appliances and redefine efficiency. Step into the future of HVAC with us!


  1. Effortless Connection: Seamlessly link DuraFlex AL lengths to PolyPro and experience unmatched convenience in your venting systems.

  2. Condensation Elimination: The aluminum inner pipe heats up rapidly, remaining hot during operation. Bid farewell to the damaging effects of flue product condensation.

  3. Versatile Compatibility: Connects DuraFlex Aluminum flex to any brand of B-vent, saving time and money during masonry chimney relining projects.

  4. Reliable Performance: Suitable for natural gas or liquid propane category I appliances, including fireplaces, furnaces, boilers, water heaters, and space heating applications.

  5. Proudly American-Made: Rest assured knowing that your DuraFlex AL Coupler is 100% manufactured in the USA, meeting the highest quality standards.

Key Features

  1. Universal Connection: Use it to connect DuraFlex AL lengths to PolyPro effortlessly, ensuring a secure and efficient venting system.

  2. Condensation Prevention: The aluminum inner pipe quickly heats up and remains hot during operation, preventing the formation of damaging condensation.

  3. Compatibility Matters: Connects DuraFlex Aluminum flex to any brand of B-vent, saving time and money on chimney relining projects.

  4. Safety First: Designed for use in combustion air only, guaranteeing safety and optimal performance.

  5. Made in the USA: Trust in American craftsmanship - our DuraFlex AL Coupler is proudly manufactured in the United States.


The DuraVent DuraFlex AL Coupler Type B Gas Vent is your go-to solution for a wide range of heating applications:

  • Natural Gas Fireplaces: Ensure a safe and efficient venting system for cozy evenings by the fire.

  • Gas-Fired Furnaces: Keep your home warm during the coldest months with reliable venting for your furnace.

  • Boilers: Optimize boiler performance while safeguarding your chimney from condensation damage.

  • Water Heaters: Enjoy hot water without worries, knowing your venting system is up to the task.

  • Space Heating Applications: Whether it's a garage, workshop, or any other space, count on DuraFlex AL Coupler for superior venting.



Model Size
Vent Type Type B Gas Vent
Materials & Const. 010” aluminum (2-ply of .005”)
Clearance 0” clearance to masonry
Listings Listed to UL 1777 and ULC S635
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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Here are just a few reasons why you should choose us:

  • Wide Selection of Products: We offer a vast selection of top-quality products from the leading brands in the industry. No matter what you're looking for, we have something for everyone.
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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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We believe that shopping should be easy, convenient, and most importantly, affordable. That's why we work hard to bring you the lowest prices on the products you love. But if you do happen to find a better deal elsewhere, we'll go the extra mile to make sure you get the best deal possible.

Here's how it works:

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