National Chimney M-Flex 3" x 15" Stainless Steel Standard Liner Kit d5.81 Available double-sided

Available double-sided

25" (B) x 4" (C) x 3" (D) Exhaust & Intake 4" x 3" Applications Direct vent gas

Breakfront facade adds depth to the classic mantel style

165W Permanently Lubricated Motor

Traditional Bespoke Electric Fireplace Insert

National Chimney M-Flex 3" x 15" Stainless Steel Standard Liner Kit d5.81 Available double-sidedM 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