DuraVent 5-Inch Diameter Type B Gas Vent Pipe - 12-Inch Length: This unit necessitates a venting pipe with a 5" inner diameter. DuraType Vent's B chimney pipe is compatible with Category I natural gas and propane-fueled appliances such as furnaces, water heaters, boilers, and fireplaces. It has a sturdy double layer construction with an inner liner of 0.012" aluminum and an outside wall of 0.018" steel. It measures 5" in diameter on the inside. This system's components connect using a secure twist-lock connection, and the complete system only requires a 1" clearance from combustibles. The part is UL and ULC listed and comes with a 25-year guarantee.

12 Inch length Efficiently vents Category I natural gas and propane-fueled appliances Resilient dual-layer construction 5" openings .012" aluminum inner liner and .018" galvanized steel outer wall Secure twist-lock connections Requires only 1" clearance to combustibles 25-year warranty UL and ULC Listed