DuraVent | Pipe DuraFlex 30' Flex SW Basic Kit

Save $100.03
DuraVentSKU: 3DFSW-30K

Sale price$900.33 Regular price$1,000.36
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Size: 3"

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The DuraFlex SW Kit is a testament to our unwavering dedication. Crafted with a smooth inner wall, this flexible stainless steel chimney liner ensures optimal appliance efficiency, leaving no room for output reduction. Bid farewell to those troublesome ridges that obstruct flue gas flow and accumulate deposits, for our smooth wall construction eliminates these obstacles, simplifying maintenance like never before. Proudly listed to UL 1777, the DuraFlex SW Kit excels in relining masonry chimneys, serving as the ultimate companion for wood and gas-burning appliances.

We understand that every project is unique, which is why we offer the flexibility to customize the length of your DuraFlex. Starting from a minimum of 10', you can tailor the DuraFlex Pro and DuraFlex SW to your exact requirements. For those needing larger diameters, rejoice, for 9"-12" options are available in custom lengths as well. Complement your setup with Ventinox components for all 9"-12" flex systems.


  1. Enhanced Efficiency: The smooth inner wall design ensures maximum appliance efficiency, reducing energy wastage.
  2. Easy Maintenance: Say goodbye to ridges that collect deposits - cleaning and maintenance have never been simpler.
  3. Versatile Customization: Tailor the flex length to suit your unique project needs.
  4. High-Quality Components: Each kit includes top-tier DuraFlex SS components for reliability you can trust.
  5. Listed to UL 1777: Rest easy, knowing you've chosen a product that meets the highest safety standards.

Key Features

  1. Comprehensive Kit: Includes DuraFlex SS Top Plate with Welded Storm Collar, DuraFlex SS Removable Vertical Cap, DuraFlex SS Connector, and DuraFlex SW Length.
  2. Multiple Length Options: Choose from 15', 20', 25', 30', and 35' lengths to fit your specific requirements.
  3. Storm Collar Integration: The top plate seals masonry chimneys securely while supporting the flex.
  4. Efficient Termination: The removable vertical cap terminates the relining system with ease.
  5. Versatile Connector: Connect DuraFlex SS length to appliances, rigid lengths, or other flex lengths effortlessly.


DuraFlex SW smooth wall flexible relining transforms your masonry chimney into a powerhouse, accommodating gas, wood pellet, oil, or wood appliances with finesse. Applications span from cozy fireplace inserts to robust furnaces, efficient boilers, and dependable water heaters.


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