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Type-B Gas Vent

Type-B Gas Vent

Models - M and MO
Double-Wall Type “B” Gas Vent for approved category I natural gas or propane-fired appliances, gas furnaces, heaters, fireplaces and boilers in accordance with NFPA 211, standards for chimneys, fireplaces, vents and solid-fuel burning appliances and NFPA 54, the National Fuel Gas Code.
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Type-B Gas Vent

Double Wall Gas Vent
Type-B Gas Vent products are tested and listed to UL 441 for approved gas appliances and feature our innovative twist-lock connection and locking tab, eliminating the need for sheet metal screws.  Metal-Fab Type B Gas Vent combines hemmed flues and casings that maximize product durability and reliability and minimize installation time.  Designed for versatility, Metal-Fab Type-B Gas Vent products 3"-6" adapt to major competing brands and when installed establish a UL Listed connection.
 
Application
For use with category I natural gas-burning or propane fired appliances such as gas boilers, fireplaces, furnaces, unit heaters and radiant tube heaters.
Listings/Standards
NFPA 54
NFPA 211
UL 441
Construction
Flue Material Thickness:
     3" - 8"/.012, aluminum alloy
     10" - 12"/.018, aluminum alloy

Casing Material Thickness:
     3" - 12"/.018, galvanized steel
Diameters
3" - 30"
Clearances
1" Minimum clearance to combustibles for 3" - 24"
2" Minimum clearance to combustibles for 26" - 30"
 

Type-B Gas Vent

Double Wall Gas Vent
Type-B Gas Vent products diameters 14″-30″ are tested and listed to UL 441 for approved gas appliances and feature our quick connect lock attached with sheet metal screws.  Designed for versatility and efficiency, Metal-Fab Type B Gas Vent combines hemmed flues and casings for precise joint alignment during installation that maximize product reliability and minimize installation time.
 
Application
For use with category I natural gas-burning or propane fired appliances such as gas boilers, fireplaces, furnaces, unit heaters and radiant tube heaters.
Listings/Standards
NFPA 54
NFPA 211
UL 441
Construction
Flue Material Thickness:
    14" - 30"/.018, aluminum alloy

Casing Material Thickness:
    3" - 14"/.018, galvanized steel        
    16" - 30"/.024, galvanized steel
Diameters
3" - 30"
Clearances
1" Minimum clearance to combustibles for 3" - 24"
2" Minimum clearance to combustibles for 26" - 30"