DuraFlex SS Stainless Steel Chimney Liner - 8“ x 20-ft. - 8DF316-20: This unit requires venting pipe with an inner diameter of 8". The DuraVent DuraFlex Zero Clearance Insulation Sleeve is used with this 20-foot chimney liner to meet the UL 1777 standard for brick chimneys and wood burning appliances. It is the most cost-effective liner for straight chimneys and, despite its low weight, is quite durable. The liner is made of .006" metal thickness and measures 8" in diameter. For your peace of mind, it comes with a manufacturer's limited lifetime warranty.

DuraFlex 20 Stainless Steel Chimney Liner 8-in. diameter Light-weight .006" metal thickness makes it stronger than other light liners Most economical liner for straight chimneys Manufacturers limited lifetime warranty