National Chimney M-Flex 7" x 25' Stainless Steel Standard Liner Kit h2.39 like your furnace

like your furnace

250° rated valve

Lava Rock / Rolled Lava Stone / Ceramic Rock

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

Available in six sizes (length)

National Chimney M-Flex 7" x 25' Stainless Steel Standard Liner Kit h2.39 like your furnaceM 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