National Chimney M-Flex 7" x 25' Stainless Steel Standard Liner Kit h2.39 250° rated valve

250° rated valve

Available in six sizes (length)

Available accessories include decorative glass

Unique double louvered cabinet doors offer adequate ventilation

Brand DuraVent Series FasNSeal Flex Model 5FSFLEX-50 Product Type Flex Length (Custom)

National Chimney M-Flex 7" x 25' Stainless Steel Standard Liner Kit h2.39 250° rated valveM FLEX standard liner kits are used for wood, oil, coal, and gas appliances. Each of our . 006" (CB) and . 005" (CBF) standard kits comes with installation instructions and a lifetime warranty. This lining kit has been installed in venting applications since 1992 and continues to be the most popular "all fuels" kit we offer. We stock 3" 8" inside diameter (ID) as well as 6" 8" outside diameter (OD) in our . 006" (CB). What's Included 1x Installation