DuraVent DuraFlex 4DFA-25 AL Length – 4″ x 25′

SKU: 4DFA-25,

Brand: Duravent


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DuraVent DuraFlex 4DFA-25 AL Length – 4″ x 25′

The DuraFlex AL kit is available in 3″ to 8″ diameters. Flex lengths are available in 25′ and 35′.

An economical venting system used for relining masonry chimney for natural gas or liquid propane category I, draft hood equipped appliances, and appliances tested and listed to use Type B Gas Vent for a wide range of applications, including: natural gas fireplaces, gas-fired furnaces, boilers, water heaters, and wall or space heating applications. Protects the masonry chimney from damaging effects of flue product condensation.

For Use with Natural Gas or Propane Gas Appliances Only


  • Inner Diameter: 4″
  • Fuel Types Compatible With: Natural Gas, Liquid Propane
  • UL Listed: Yes
  • Length: 25′
  • Double Wall Construction
  • Limited Lifetime Warranty

DuraFlex Aluminum Flex Liner is available in 3″ to 8″ diameters and in 25′, 35′, and 50′ lengths.

Weight.5 lbs


Duratech Install manual




M&G DuraVent, Inc. (“DuraVent”) provides this limited lifetime warranty for all of its products with the exception of Ventinox® (lifetime), and PolyPro® (ten years). Subject to the limitations set forth below, DuraVent warrants that its products will be free from defects in material or manufacturing, if properly installed, maintained and used. DuraVent products are fully warranted if installed only by a professional installer. See owners manual for full warranty.


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