National Chimney M-Flex 4" x 15" Stainless Steel Standard Liner Kit btu38225 UL 441 Clearances 1" Minimum

UL 441 Clearances 1" Minimum clearance to combustibles for 3" - 24" Diameter 8

Adjustable Vent Free Hood

Easy to clean and maintain

This way we can guarantee that they are top quality can be used in a fire pit and have no left-over gas pockets that could burst

Sold As Each 3

National Chimney M-Flex 4" x 15" Stainless Steel Standard Liner Kit btu38225 UL 441 Clearances 1" MinimumM 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