DuraVent 4" Diameter Type B Gas Vent Pipe - 48" Length: This unit necessitates a venting pipe with a 4" inner diameter. Looking for a versatile and long-lasting vent that can be used with either gas or propane to power your home? This model includes a vent designed specifically for category I natural gas and propane appliances. This item is built with a durable dual-layer design. Twist-lock connections are secured by a .012" aluminum inner liner and a .018" galvanized steel outer wall, which requires only 1" of clearance from combustibles. Allow DuraVent to take care of everything when you buy their dependable installation pipe.

48 Inch length Efficiently vents Category I natural gas and propane-fueled appliances Resilient dual-layer construction 4" 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