DuraVent | DuraFlex Pro Stainless Steel 35' Flex Pipe

Save $85.21
DuraVentSKU: 3DFPRO-35

Sale price$766.87 Regular price$852.08
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Size: 3"

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DuraVent, the undisputed leader in the venting industry, proudly presents the DuraFlex Pro Stainless Steel Length - a remarkable addition to our line of engineered venting products. With a rich history of providing innovative, safe, and professional solutions for the HVAC and Hearth markets, DuraVent has consistently met the highest standards of quality. Now, we bring you the DuraFlex Pro, the pinnacle of flexible steel liners, designed to exceed your expectations.

The DuraFlex Pro Stainless Steel Length sets a new standard in venting technology. It boasts an impressive 20% more stainless steel per foot compared to other liners in the market, ensuring durability and longevity. What truly sets it apart is its extreme flexibility, making installations a breeze, even in situations requiring multiple offsets. With diameters ranging from 3" to 12", available in various lengths, kits, and custom options, the DuraFlex Pro adapts to your unique needs. Plus, it is crafted from highly corrosion-resistant 316 Stainless Steel, providing the ultimate protection against environmental wear and tear. Rest assured, it's listed to meet the stringent standards of UL 1777 and ULC S635.

At DuraVent, we understand that every project is unique. That's why we offer customizable options for DuraFlex Pro. Need a specific length? No problem. We can accommodate custom orders starting at a minimum length of 10 feet. For larger systems ranging from 9" to 12" in diameter, we recommend the use of Ventinox components for optimum performance.

Key Features

  1. Unmatched Strength: 20% more stainless steel per foot.
  2. Extreme Flexibility: Ideal for complex installations.
  3. Wide Diameter Range: From 3" to 12".
  4. Corrosion-Resistant: Crafted from 316 Stainless Steel.
  5. Compliance Assured: Listed to UL 1777 and ULC S635 standards.


  1. Simplified Installations
  2. Exceptional Durability
  3. Versatile Sizing
  4. Rust-Resistant
  5. Safety-First Design


The DuraFlex Pro is your go-to solution for a wide range of applications, making it a versatile choice for venting needs. Whether you're working with gas, wood pellet, oil, or wood appliances, this ultra-flexible relining system ensures top-tier performance. Common applications include fireplace inserts, furnaces, boilers, and water heaters. Count on DuraFlex Pro to deliver unmatched reliability and safety in every scenario.


Model Size Flex Length
3DFPRO-35 3" I.D 35 ft.
4DFPRO-35 4" I.D 35 ft.
5DFPRO-35 5" I.D 35 ft.
55DFPRO-35 5.5" I.D 35 ft.
6DFPRO-35 6" I.D 35 ft.
7DFPRO-35 7" I.D 35 ft.
8DFPRO-35 8" I.D 35 ft.
Materials 316 stainless steel
Construction Single-Wall
Clearance 0” clearance for gas, oil, and pellet applications.
Clearance 1” clearance to masonry for wood-burning
Listings Listed to UL 1777 and ULC S635 (MH45609).
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.

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.

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