Hart & Cooley Gas Vent Pipe, Series: RPA, 4 in ID x 3-5/8 in OD Dia, 12 in Adjustable Length, Steel/Aluminum, Galvanized, Domestic
The Hart & Cooley double-wall, air-insulated B-Vent system is secured by locking joints. Properly installed, the vent won't 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 400°F above ambient for Category I appliances.