DuraVent | DuraFlex 304 Stainless Steel 30' Flex Pipe Length

Save $64.18
DuraVentSKU: 3DF304-30

Sale price$577.64 Regular price$641.82
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Size: 3"

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In the world of venting solutions, DuraVent stands as the unrivaled leader. With a storied legacy of engineering excellence, we proudly present the DuraFlex 304 Stainless Steel Flex Pipe. This 30-foot masterpiece is a testament to our commitment to innovation, safety, and professionalism, catering to the exacting demands of the HVAC and Hearth markets.

DuraFlex 304 and 316, lighter and more cost-effective liners, offer an optimal solution for chimneys with minimal offsets. Designed to excel with wood-burning, non-condensing gas, and oil-fired appliances, DuraFlex 304SS and 316SS are UL 1777 and ULC S635 certified, ensuring top-tier performance. For applications demanding enhanced corrosion resistance, such as coal-fired appliances, DuraFlex 316 is the recommended choice.


  1. Safety First: Crafted from 304 Stainless Steel, this flex pipe ensures robust corrosion resistance, making it suitable for various applications.
  2. Customizable: Tailor the length to your specific needs, with options available from 10' to 100' for diameters ranging from 3" to 8".
  3. Versatile Application: Ideal for wood-pellet, non-condensing gas, wood-burning, and oil appliances.
  4. Ovalization Capability: The 3"-8" diameter flex can be ovalized up to the first 4', providing adaptability to diverse installations.
  5. Warranty Assurance: Backed by a limited-lifetime warranty, this flex pipe guarantees your investment's longevity.

Key Features

  1. Custom Lengths: Available for 3”-8” diameters, with a minimum length of 10' for custom orders.
  2. Ovalization Option: Enables adaptability to unique installation needs.
  3. Single-Wall Construction: Crafted for durability and efficient venting.
  4. Clearance Specifications: 0” clearance for gas, oil, and pellet applications; 1” clearance to masonry for wood-burning.
  5. UL and ULC Certified: Listed to UL 1777 and ULC S635 (MH45609) standards.


DuraFlex 304 Stainless Steel Flex Pipe is the go-to solution for a wide range of applications. Use it for flexible relining in masonry chimneys, seamlessly integrating with gas, wood pellet, oil, or wood appliances. Its versatility extends to fireplace inserts, furnaces, boilers, and water heaters, making it an indispensable asset in enhancing your venting system.


Model Size Flex Length
3DF304-30 3" I.D 30 ft.
4DF304-30 4" I.D 30 ft.
5DF304-30 5" I.D 30 ft.
55DF304-30 5.5" I.D 30 ft.
6DF304-30 6" I.D 30 ft.
7DF304-30 7" I.D 30 ft.
8DF304-30 8" I.D 30 ft.
Materials 304 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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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.

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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.

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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.

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