DuraVent | DuraFlex SW Stainless Steel 30' Flex Pipe Length

Save $87.42
DuraVentSKU: 3DFSW-30

Sale price$786.79 Regular price$874.21
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Size: 3"

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Elevate your home's safety, efficiency, and style with the DuraVent DuraFlex SW 30' Stainless Steel Chimney Liner. Crafted by the industry leader, DuraVent, this chimney liner is a testament to innovation, quality, and peace of mind. With an unwavering commitment to excellence, DuraVent has solidified its reputation as the premier company in the venting industry.

The DuraFlex SW chimney liner boasts a smooth inner wall design that ensures maximum appliance efficiency. Say goodbye to restrictions that hinder flue gas flow and the buildup of deposits. The absence of ridges not only streamlines airflow but also simplifies cleaning and maintenance, making it a dream come true for homeowners and professionals alike. Rest assured, this chimney liner is listed to UL 1777, meeting the highest safety standards.

Tailor your chimney liner precisely to your needs. DuraVent offers custom lengths starting from 10', and for those requiring larger diameters, the 9"-12" options are also available through custom orders. With DuraVent, flexibility and customization are at your fingertips. Plus, for all 9"-12" flex systems, Ventinox components are the perfect complement.


  1. Enhanced Efficiency: The smooth inner wall design maximizes appliance efficiency, helping you save on energy costs.
  2. Easy Maintenance: Say goodbye to ridges that trap debris – cleaning and maintenance have never been simpler.
  3. Safe and Certified: UL 1777 listing guarantees safety and quality, giving you peace of mind.
  4. Customization: Tailor your chimney liner to your specific requirements, ensuring a perfect fit.
  5. Versatile Applications: Suitable for gas, wood pellet, oil, or wood appliances, including fireplace inserts, furnaces, boilers, and water heaters.

Key Features

  1. Smooth Inner Wall: Promotes optimal airflow and easy maintenance.
  2. UL 1777 Listed: Complies with the highest safety standards.
  3. Custom Lengths: Customize your liner from 10' and up.
  4. Multiple Diameters: Options for 3"-8" and 9"-12" diameters.
  5. Lifetime Warranty: Backed by a limited lifetime warranty for your peace of mind.


DuraFlex SW smooth wall flexible chimney lining is perfect for masonry chimneys, ensuring top performance with gas, wood pellet, oil, or wood appliances. Its versatile applications include fireplace inserts, furnaces, boilers, and water heaters, making it a go-to choice for professionals and homeowners alike.


Model Size Flex Length
3DFSW-30 3" I.D 30 ft.
4DFSW-30 4" I.D 30 ft.
5DFSW-30 5" I.D 30 ft.
55DFSW-30 5.5" I.D 30 ft.
6DFSW-30 6" I.D 30 ft.
7DFSW-30 7" I.D 30 ft.
8DFSW-30 8" I.D 30 ft.
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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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:

  • Find a lower price on the same product from another retailer.
  • 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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