Metal-Fab 4" Dia X 12" L Type B Double Wall Gas Vent Pipe, Aluminum
This efficient vent pipe complies with NFPA 211 and UL 441 standards for gas appliances. Material: Aluminum alloy inner and G90 galvanized steel outer casing. Application: Gas Boiler, Fireplace, Furnace, Unit Heater, Radiant Tube Heater.