National Chimney M-Flex 3" x 25" Stainless Steel Standard Liner Kit watt1530 Match a standard 1

Match a standard 1

Created especially for larger fireplaces found in contemporary homes

Sturdy metal legs with foot pads protecting the floor

Its name says it all

Required when the chimney extends 5 feet or more above the roof

National Chimney M-Flex 3" x 25" Stainless Steel Standard Liner Kit watt1530 Match a standard 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