National Chimney M-Flex 6" x 35" Stainless Steel Standard Liner Kit 73in but helps dress out the

but helps dress out the fireplace opening

Pre-Programmed-Color LED Lighting Beneath Burner

Some stoves require extremely high R-values

the Left Corner Fireplace Insert features two open sides

National Chimney M-Flex 6" x 35" Stainless Steel Standard Liner Kit 73in but helps dress out 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