DuraVent | DuraFlex AL - Aluminum Flex Length Type B Gas Vent 2" Inner Diameter Pipe

Save $31.53
DuraVentSKU: 2DFA-25

Sale price$126.13 Regular price$157.66
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Size by ft.: 25'

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Elevate your HVAC and hearth experience with the DuraVent Type B Gas Vent system. As the premier company in the venting industry, DuraVent has earned its reputation by delivering innovative, safe, and professional products. Our Type B Gas Vent sets new standards with DuraLock, an ingenious connection system. Align the indicators, feel the ends grasp together, and hear the satisfying snap as the connection locks firmly in place.

Designed to meet the rigorous demands of the job site, our Type B Gas Vent features a recessed inner wall that eliminates handling damage. It quickly heats up during appliance operation, minimizing condensation in both the appliance and vent system. Whether you need pipe lengths from 6 to 60 inches or a variety of adjustable and rigid fittings, we've got you covered.

Upgrade your venting system with the DuraVent 2" Aluminum Flex Vent Pipe – a trusted choice for those seeking cost-effective and dependable venting solutions. DuraVent, the premier name in the venting industry, has earned its reputation as an industry leader by consistently delivering innovative, safe, and professional products for the HVAC and Hearth markets.

DuraFlex AL is an economical yet high-performing venting system designed for relining masonry chimneys. It's the go-to choice for natural gas or liquid propane category I appliances equipped with draft hoods, as well as appliances tested and listed to use Type B Gas Vent. This flexible aluminum marvel opens up a world of possibilities, offering impeccable venting for natural gas fireplaces, gas-fired furnaces, boilers, water heaters, and wall or space heating applications. Notably, it provides vital protection to your masonry chimney, safeguarding it from the damaging effects of flue product condensation.


  1. Efficiency Redefined: DuraFlex AL features a single-wall (1-ply) aluminum construction that heats up rapidly, eliminating condensation in the appliance and vent system.
  2. Versatile Lengths: Available in 25', 35', and 50' flex lengths, ensuring a perfect fit for your unique venting needs.
  3. Cost Savings: Connects seamlessly to any brand of B-vent, allowing you to reline your chimney without replacing the existing B-vent connector, saving you time and money.
  4. Reliable Performance: This aluminum flex liner remains hot during operation, ensuring optimal venting and preventing condensation-related issues.
  5. Proudly American: Rest easy knowing that your DuraFlex AL is 100% manufactured in the USA, upholding the highest quality standards.


DuraFlex AL (DFAL) aluminum flexible relining is the versatile answer to your venting needs. It's perfectly suited for a range of applications, including:

  • Natural Gas Fireplaces: Enhance the safety and performance of your fireplace with reliable venting.
  • Gas-Fired Furnaces: Keep your home cozy and warm with efficient venting for your furnace.
  • Boilers: Optimize your boiler's efficiency and ensure it operates at its best.
  • Water Heaters: Enjoy reliable hot water while safeguarding your chimney.
  • Wall or Space Heating Applications: Whether it's your home or workspace, DuraFlex AL offers the venting reliability you need.

Ideal Applications

For those seeking an economical yet efficient venting solution, DuraFlex AL is the ideal choice. It's specifically designed for:

  • Category I Appliances: Ensure safety and efficiency for appliances with draft hoods.
  • Natural Gas and Liquid Propane: Versatile enough to handle both fuel types.
  • Type B Gas Vent Compatibility: Perfectly suited for appliances tested and listed to use Type B Gas Vent.


Model Size Flex Length
2DFA-25 2" 25 ft.
2DFA-35 2" 35 ft.
2DFA-50 2" 50 ft.
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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At Belleflame, we believe that shopping should be simple, stress-free, and most importantly, enjoyable. That's why we work hard to bring you the best products, prices, and customer service in the industry.

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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