Metal-Fab 5PWT Biomass Chimney L Vent Wall Thimble

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Metal-Fab provides complete and comprehensive venting solutions to the HVAC, Hearth and Plumbing markets.  Founded in 1958 on the premise that offering better products and services would be the key to our success.

Metal-Fab continues to operate today as a privately held entity with the same core values that lead to success while creating steady, stable growth over the past six decades.

Customer needs are the highest priority at Metal-Fab that is why every customer receives a unique experience while choosing from a full line of high-quality venting products for commercial, residential and industrial applications. 

Cutting-edge manufacturing systems, innovative designs, patent products, unmatched product quality, and a focus for detail have resulted in a leadership position within the industries Metal-Fab serves.  Our constant product improvement process and experience in developing and engineer products for safe, efficient appliance operation sets Metal-Fab apart from the competition.


Biomass factory-built chimney and vent intended for use with Biomass fuel appliances approved for Type L low-temperature venting systems in accordance with “Standard for Chimneys, Fireplaces, Vents, and Solid-Fuel Burning Appliances,” NFPA 211, and the International Mechanical Code.

Biomass Chimney features a corrosion-resistant 430 stainless flue and galvanized steel casing designed to operate in highly corrosive biofuel applications.  Our cutting-edge positive twist-lock design, locking tabs and rope gasket at each joint, prevents fly ash leakage and reduces installation time.


  • Provides the proper clearance for the “L” Vent pipe when it passes through a combustible wall.
  • Wall Thimble
  • Adjustable: 5 to 9.5"
  • Height: 13"


WARNING: Proposition 65