DuraFlex SS Stainless Steel Chimney Liner - 6" x 30-ft. - 6DF316-30: A 6" inner diameter vent pipe is required for this unit. This DuraFlex chimney liner was created with your heating system's safety and efficiency in mind. This 6" by 30-foot length of liner is made of .006" light-weight metal and comes with a manufacturer's limited lifetime warranty. It has been OMNI-listed to UL 1777 and ULC S635 and is stronger than conventional light-weight liners (43-P-02-2). When adequately insulated, clearance requirements are 0" to masonry for gas and 0" to masonry for woodburning, and 1" to masonry for pellet and oil.

DuraFlex 30 Stainless Steel Chimney Liner Light-weight .006" metal thickness makes it stronger than other light liners Most economical liner for straight chimneys Manufacturers limited lifetime warranty