National Pre-Insulated 6"x30' Stainless Steel M-Flex Aluminum Outer Liner

The National Chimney M-Flex Pre-Insulated Chimney Liner Kit is an easy-to-install, high-performance venting solution for wood stoves and fireplace inserts. It is manufactured with a 316L stainless steel inner liner and a durable aluminum outer casing, enhancing chimney efficiency while maintaining safe, high-temperature operation.