RoundFlex is classified as a heavy liner, but it's really just heavy - duty. If you are a homeowner or a chimney professional looking for the first and last chimney liner you'll ever have to buy, step up to the plate by using the HomeSaver RoundFlex 316 - Alloy Chimney Liner 6 inch x 5 ft in your next chimney installation.RoundFlex Chimney Liner for 6 pipe Sturdy 316 - alloy construction Contains molybdenum to protect against corrosion Meets UL tolerance nominal thickness of .015 - .018 UL ULC listed for wood, coal, oil, and non - condensing gas when installed according to the manufacturers instructions Manufacturers Lifetime Warranty for Wood BurningDiameter: 6 Length: 5'
