DuraVent Type B Gas Vent Zero to 90-Degree Adjustable Vent Pipe Elbow - 4" Diameter - 4GVL90: This unit requires a venting pipe with a 4" inner diameter. Please note that wall straps must be ordered separately. DuraVent has devised this helpful vent pipe elbow for 4" openings to efficiently vent your category 1 natural gas or propane fueled appliance. With this adjustable vent pipe elbow, you can simply install piping around venting barriers. It has secure twist-lock connections and only needs 1" of clearance from combustibles. This strong vent pipe elbow can turn 360 degrees at the base and adjust up to a 90 degree angle, making it ideal for practically any venting challenge.

Efficiently vents Category I natural gas and propane-fueled appliances Offsets venting obstructions Swivels 360 degree at base Adjusts from 0 degree to 90 degree angle 4" opening Resilient dual-layer construction .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 *Please Note: Separately purchased Wall Straps are required.