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DuraVent 3" x 4" & 4" x 5" Stepped Increaser

Original price $137.21
Original price $137.21 - Original price $173.53
Original price $137.21
Current price $124.74
$124.74 - $157.75
Current price $124.74
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DuraVent 3" x 4" & 4" x 5" Stepped Increaser

The DuraVent 3" x 4" and 4" x 5" Stepped Increaser ensures improved air flow and ventilation in chimneys and stoves, thanks to its superior wall thickness and strong construction. In turn, this reduces the risk of dangerous build-up of heat and creosote. Its stepped design ensures an airtight seal for maximum performance.

Use to increase vent diameter when space constraints are an issue. More increasers available, contact customer service for information. Available in 316L Stainless Steel


  • Available Inner Diameter : "3" & "4"
  • Fuel Types Compatible With: Gas
  • UL Listed: Yes
  • Length: 6"
  • Single Wall Construction

Typical Installation(Refer this if required):

Commercial Applications

Commercial projects may require custom parts and unique system designs. DuraVent offers complete project assistance:

  • Engineering Services: Personalized system design services offer comprehensive CAD submittal drawing and complete bills of materials.
  • Custom Parts: If your project requires innovative solutions, contact DuraVent for custom parts that meet your specific project needs.
  • FasNSeal W2: FasNSeal W2 is the ideal choice for commercial applications where there is a need for low clearances to combustibles.
  • Up to 16” Vent Diameters: Many commercial applications require large diameter systems due to the units size and output. Large diameters are available in single and double wall, featuring FasNSeal’s triple lipped directional gaskets and built-in locking band which provides a safe and convenient installation.

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