DuraVent | AL Kit Flex Relining 35' DuraFlex Type B Gas Vent Pipe

Save $78.60
DuraVentSKU: 3DFA-35K

Sale price$314.38 Regular price$392.98
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Size: 3"

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Welcome to the future of efficient venting solutions with the DuraVent 35' DuraFlex AL Kit. In a world where the quality of your HVAC system can make or break your comfort, trust DuraVent, the industry leader in venting products. With over [Years in Business] years of expertise, we bring you a cost-effective and reliable solution that not only elevates your HVAC performance but also protects your masonry chimney from the harsh effects of condensation.

At DuraVent, we take pride in engineering products that redefine the standards of the industry. The DuraFlex AL Kit is no exception. With a strong focus on innovation and safety, this kit is designed to reline masonry chimneys for natural gas or liquid propane appliances, making it suitable for a wide range of applications, including natural gas fireplaces, gas-fired furnaces, boilers, water heaters, and wall or space heating.

The heart of this kit lies in its aluminum inner pipe, which heats up rapidly and remains hot during operation, effectively eliminating condensation within your appliance and vent system. This not only ensures the longevity of your HVAC system but also enhances its efficiency. Plus, the DuraFlex AL Kit seamlessly connects to any brand of B-vent, saving you valuable time and money. And the best part? It's proudly manufactured in the USA, guaranteeing top-notch quality.

Upgrade your HVAC system today with the DuraVent 35' DuraFlex AL Kit, where reliability, efficiency, and innovation converge for the ultimate venting experience.


  1. Efficient Heating: The aluminum inner pipe heats up quickly, ensuring your appliance operates at its peak efficiency.
  2. Condensation Control: Say goodbye to condensation issues, as this kit eliminates them, safeguarding your chimney.
  3. Cost-Saving Solution: Connects effortlessly to existing B-vents, saving you installation time and homeowner expenses.
  4. Trusted American Quality: Made entirely in the USA for unwavering reliability.
  5. Versatile Applications: Ideal for various gas appliances, including fireplaces, furnaces, boilers, and more.

Key Features

  1. Rapid Heating: The aluminum inner pipe heats up faster, enhancing performance.
  2. Condensation Elimination: Keeps your appliance and vent system free from damaging condensation.
  3. Easy Installation: Connects seamlessly to existing B-vents, reducing installation time and costs.
  4. Made in the USA: Ensures top-quality craftsmanship and reliability.
  5. Complete Kit: Includes essential components like the top plate, cap, mortar sleeve, and aluminum length.


The DuraVent 35' DuraFlex AL Kit is your go-to choice for a range of applications:

  • Natural gas fireplaces
  • Gas-fired furnaces
  • Boilers
  • Water heaters
  • Wall or space heating applications


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

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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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