National Chimney M-Flex 4" x 25" Stainless Steel Standard Liner Kit d9.63 A combination of all the

A combination of all the vibrant blue hues of the sea

Model 4DFPRO-170 Product Type Length

bedroom and more

5" (D) x 29" (H)

Black Paint

National Chimney M-Flex 4" x 25" Stainless Steel Standard Liner Kit d9.63 A combination of all theM 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