National Chimney M-Flex 4" x 15" Stainless Steel Standard Liner Kit h22.63 Part Number IF-BTSS Dimensions L-1

Part Number IF-BTSS Dimensions L-1

and all necessary fittings to convert your unit from propane gas to natural gas

U/Hour rating maximum 593

Masonry Inner Liner

National Chimney M-Flex 4" x 15" Stainless Steel Standard Liner Kit h22.63 Part Number IF-BTSS Dimensions L-1M 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