DuraFlex SS Stainless Steel Chimney Liner - 5.5" x 15-ft. - 55DF316-15: A 6" inner diameter vent pipe is required for this unit. You can have a safe venting system that promotes air circulation for your heating appliance with this easy-to-install DuraFlex chimney liner. The 5.5" diameter may be utilized with most fireplace systems, and the sturdy stainless-steel material avoids harm from corrosion or accumulation. This liner can be used to make a vent system for fireplace inserts, furnaces, water heaters, and boilers, as well as to increase the efficiency of your heating device.

DuraFlex 15 Stainless Steel Chimney Liner 5.5-in. diameter Light-weight .006" metal thickness makes it stronger than other light liners Most economical liner for straight chimneys Manufacturers limited lifetime warranty