what is type b gas vent
Type B Gas Vent Systems Give You These Important Advantages. Safety of the Hart & CooleyÂ® system is assured by the double-wall, air-insulated design and locking joints. Properly installed, the vent cannot come apart through vibration, and offers protection against vent failure or fire hazard. Type B Gas Vent is designed for negative pressure applications and flue gas temperatures not exceeding 400Â°F above ambient for Category I appliances.
HART & COOLEYÂ® B-VENT complies with the latest Underwriters Laboratories Standard No. 441 and Bears the Mark. 1  3â to 12â inner and outer pipe curled together as an integral unit. 2  14â - 30â sizes have a snap-lock coupling system.  Unique locking band provides 360Â° turning radius of the pipe and fittings.