DuraVent 35' Flex Pipe DuraFlex SW Tee Kit

Size: 3"

Estimated Arrival: Between and . (To All Contiguous States)

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DuraVent is the premier company in the venting industry. With a broad range of engineered venting products, DuraVent has earned its reputation as the industry leader by offering innovative, safe, and professional products for the HVAC and Hearth markets.

DuraFlex SW is a smooth inner-wall, flexible stainless steel chimney liner. The smooth inner wall provides no output reduction allowing for total appliance efficiency. Smooth wall construction eliminates ridges that restrict flue gas flow and collect deposits. The lack of ridges facilitates cleaning and maintenance. DuraFlex SW is ideal for relining masonry chimneys for wood and gas-burning appliances. Listed to UL 1777.

Customize The Flex You Need

All DuraFlex is available for custom lengths (minimum 10' length) orders. DuraFlex Pro and DuraFlex SW also offer 9"-12" diameters when ordered in custom lengths. (minimum 10' length). Use Ventinox components for all 9"-12" flex systems.



  • Kit includes DuraFlex SS Top Plate w/welded Storm Collar, DuraFlex SS Removable Vertical Cap, DuraFlex SS Tee with Cap, and DuraFlex SW length.
  • Flex lengths are available in 15’, 20’, 25’, 30’, and 35’.


DuraFlex SS Top Plate With Welded Storm Collar
Used to seal the top of masonry chimney and support flex. Flex is secured to the storm collar with a fast connect band.
DuraFlex SS Removable Vertical Cap
Use to terminate a relining system. Attach to storm collar with fast connect band.
DuraFlex SS Tee with Cap
Use to attach to DuraFlex SS length with a fast connect band. A removable branch connects the tee body with an internal fast connect band.
DuraFlex SW Length
Use with wood-pellet, non-condensing gas, wood-burning, and oil appliances.



DuraFlex SW smooth wall flexible relining for a masonry chimney. Use with gas, wood pellet, oil, or wood appliances. Applications include fireplace inserts, furnaces, boilers, and water heaters.



    Model Size Flex Length
    3DFSW-35KT 3" I.D 35 ft.
    4DFSW-35KT 4" I.D 35 ft.
    5DFSW-35KT 5" I.D 35 ft.
    55DFSW-35KT 5.5" I.D 35 ft.
    6DFSW-35KT 6" I.D 35 ft.
    7DFSW-35KT 7" I.D 35 ft.
    8DFSW-35KT 8" I.D 35 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




    Warning: This product can expose you to Chromium, which is known in the state of California to cause cancer, congenital disabilities, or other reproductive harm. For more information, see CA Prop 65 Warning