DuraVent Type B Gas Vent 3" to 10" Adjustable Vent Pipe - 4" Diameter - 4GV12A: This unit necessitates a venting pipe with a 4" inner diameter. When it comes to erecting a chimney, strength isn't the only quality to admire. You should also ensure that it can be placed safely and that it has some flexibility. 3" to 10" Adjustable Tee Dura-Vent Type B Gas Vent Pipe possesses all three of these characteristics, plus a few more! You'll be amazed at how much it improves your fireplace once you've installed it in your chimney.

Efficiently vents Category I natural gas and propane-fueled appliances Resilient dual-layer construction 4" opening Adjusts from 3" to 10" in length .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