DuraVent | AL - Aluminum Flex Length Type B Gas Vent Pipe 35' DuraFlex

Save $52.03
DuraVentSKU: 3DFA-35

Sale price$208.13 Regular price$260.16
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Size: 3"

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When it comes to ensuring the safety and efficiency of your HVAC system, you deserve nothing but the best. Introducing the DuraVent 35' DuraFlex AL Aluminum Gas Vent Pipe – the industry's trusted solution for all your venting needs.

With over years of innovation and expertise in the field, DuraVent stands as a beacon of excellence in the venting industry. Our commitment to providing top-quality products has made us the go-to choice for professionals in HVAC and Hearth markets. DuraVent is synonymous with innovation, safety, and professionalism, and our DuraFlex AL Aluminum Gas Vent Pipe is a testament to our dedication.

Designed for relining masonry chimneys, this economical venting system is compatible with natural gas or liquid propane category I appliances equipped with draft hoods. From gas fireplaces to furnaces, boilers to water heaters, and even wall or space heating applications – DuraFlex AL ensures the optimal performance of your appliances while protecting your masonry chimney from the corrosive effects of flue product condensation.


  • Efficiency: DuraFlex AL's aluminum construction heats up quickly, eliminating condensation in your appliance and vent system.
  • Versatility: Suitable for a wide range of applications, from gas fireplaces to water heaters.
  • Cost-Effective: Save time and money by connecting DuraFlex Aluminum flex to any brand of B-vent.
  • Reliability: UL 1777 aluminum liner guarantees durability and safety.
  • Made in the USA: Trust in a product that's 100% manufactured in the USA.

Key Features

  1. Multiple Lengths: Available in 25', 35', and 50' flex lengths to suit your installation needs.
  2. Quick Heating: The aluminum inner pipe heats up rapidly, ensuring efficient venting.
  3. Condensation Prevention: Keeps the vent system hot during operation to prevent condensation.
  4. Compatibility: Works seamlessly with Category I gas-burning appliances equipped with draft hoods.
  5. Universal Fit: Connects easily to any brand of B-vent, saving time and money during installation.


The DuraVent 35' DuraFlex AL Aluminum Gas Vent Pipe finds its place in a wide range of applications:

  • Gas Fireplaces: Ensure your gas fireplace operates efficiently and safely.
  • Gas-Fired Furnaces: Improve the performance and lifespan of your furnace.
  • Boilers: Keep your boiler running smoothly with reliable venting.
  • Water Heaters: Protect your water heater and enjoy hot showers without worries.
  • Wall or Space Heating: Ideal for wall or space heating applications, providing consistent venting performance.



Model Size Flex Length
3DFA-35 3" I.D 35 ft.
4DFA-35 4" I.D 35 ft.
5DFA-35 5" I.D 35 ft.
55DFA-35 5.5" I.D 35 ft.
6DFA-35 6" I.D 35 ft.
7DFA-35 7" I.D 35 ft.
8DFA-35 8" I.D 35 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.

At Belleflame, we're committed to providing our customers with the best prices on the market. That's why we offer a 110% best price guarantee. If you find a better deal on the same product somewhere else, just let us know and we'll beat it by an additional 10%.

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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  • Contact us with the details of the offer, including the website or store name, product name, and price.
  • We'll verify the price and beat it by an additional 10%.

It's that simple! Our 110% best price guarantee ensures that you'll always get the best deal possible when you shop with us. So, why wait? Start shopping now and experience the difference of shopping with Belleflame.

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