DuraVent | Pipe Length DuraFlex 304 Stainless Steel 20' Flex

Save $43.16
DuraVentSKU: 3DF304-20

Regular price$388.41 Sale price$431.57

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Size: 3"
⛟ Estimated Delivery Date: Between and to all states excl. Alaska & Hawaii.

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Are you ready to take your venting system to the next level? Look no further than DuraVent's 20' Flex Pipe Length in durable 304 Stainless Steel. As the leading name in the venting industry, DuraVent has consistently delivered innovative and professional solutions for the HVAC and Hearth markets. Now, with DuraFlex 304 Stainless Steel, you can experience unmatched quality and performance.

DuraFlex 304SS is designed for wood-burning, non-condensing gas, and oil-fired appliances. Its lighter and more economical construction makes it the ideal choice when dealing with minimal offsets in your chimney. Plus, it's listed as UL 1777 and ULC S635 for your peace of mind. For even greater corrosion resistance, particularly in coal-fired appliances, consider upgrading to DuraFlex 316SS. With DuraVent, you're investing in safety, reliability, and longevity for your venting needs.


  1. Premium Quality: DuraFlex 304 Stainless Steel ensures long-lasting durability and performance, backed by the industry leader.

  2. Versatile Usage: Suitable for wood-burning, gas, and oil appliances, offering flexibility in your heating choices.

  3. Corrosion Resistance: DuraFlex 304SS is designed to withstand various environments, providing added durability.

  4. Customizable Lengths: Order the exact length you need, from 10' to 100', minimizing waste and optimizing installation.

  5. Ovalization Option: Flexibility extends to shape; you can ovalize up to the first 4' of the 3"-8" diameter flex to fit your unique requirements.

Key Features

  1. Custom Lengths: Tailor the pipe to your project with lengths available for 3"-8" diameters.

  2. Versatile Sizing: Minimum 10' length for custom orders, and a maximum of 100' for 3"-8" diameters.

  3. Ovalization Capability: Flexibility in shaping allows for the adaptation of the pipe to your specific needs.

  4. Wide Compatibility: Suitable for use with wood-pellet, non-condensing gas, wood-burning, and oil appliances.

  5. Upgrade Option: Consider DuraFlex 316 Stainless Steel for enhanced corrosion resistance, perfect for coal-fired appliances.


Model Size Flex Length
3DF304-20 3" I.D 20 ft.
4DF304-20 4" I.D 20 ft.
5DF304-20 5" I.D 20 ft.
55DF304-20 5.5" I.D 20 ft.
6DF304-20 6" I.D 20 ft.
7DF304-20 7" I.D 20 ft.
8DF304-20 8" I.D 20 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.

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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