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Free Shipping over $299 | No Sales Tax except WI | Contact Us for Deals
Free Shipping over $299 | No Sales Tax except WI | Contact Us for Deals

National Chimney M-Flex Chimney Liner | 6-Inch

SKU CB650
Original price $1,369.22 - Original price $1,369.22
Original price
$1,369.22
$1,369.22 - $1,369.22
Current price $1,369.22

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National Chimney M-Flex Chimney Liner | 6-Inch

The National Chimney M-FLEX 6-Inch Stainless Steel Chimney Liner, a premium solution designed for chimney relining and new construction installations. Engineered for superior performance, this 6-inch flexible chimney liner delivers excellent draft efficiency, improved airflow, and reliable venting for wood stoves, fireplaces, and insert applications.

Built for long-lasting durability, this stainless steel chimney liner system combines strength and flexibility to navigate existing chimney structures with ease. Ideal for homeowners and professionals, the National Chimney M-FLEX liner kit ensures safe, efficient exhaust flow while resisting corrosion and high-temperature conditions. Perfect for upgrading aging chimneys, it provides a dependable chimney venting solution that enhances heating efficiency and overall system performance.

Features

  • Premium 316L Stainless Steel Chimney Liner Construction – Manufactured from high-grade .006” thick 316L stainless steel, this 6-inch chimney liner delivers exceptional durability, corrosion resistance, and protection against creosote buildup for long-lasting chimney performance.
  • UL 1777 Listed All-Fuel Chimney Liner System – Fully tested and certified under UL 1777, UL 64, and UL 441 standards, ensuring safe and reliable venting for wood, pellet, coal, oil, gas, and corn-burning appliances.
  • Flexible Chimney Liner for Easy Installation – Designed with a 7-ply interlocked and crimped construction, this flexible chimney liner kit easily navigates tight bends, offsets, and existing masonry chimney structures.
  • Gas and Watertight Sealing Technology – Engineered to create a secure airtight and watertight chimney seal, supporting thermal expansion and contraction while maintaining optimal venting efficiency.
  • High-Performance Chimney Relining Solution – Ideal for chimney relining projects, improving draft performance, enhancing airflow, and ensuring safer exhaust gas evacuation in residential heating systems.
  • Enhanced Draft & Venting Efficiency – Optimizes chimney airflow to improve appliance efficiency and reduce buildup, making it a reliable stainless steel chimney venting system for modern homes.
  • Superior Flexibility for Tight Chimney Spaces – The corrugated flexible design allows for smooth installation through narrow or offset chimneys, reducing installation time and effort.
  • Lifetime Transferable Warranty Protection – Backed by a lifetime transferable warranty when professionally installed and maintained, ensuring long-term confidence and product reliability.

Specifications

Specification Details
Brand National Chimney
Model M-FLEX Stainless Steel Chimney Liner
Material 316L Stainless Steel
Steel Thickness .006 inches
Diameter 6 inches
Available Lengths 25 ft, 50 ft
Construction Corrugated, 7-ply interlocked and crimped
UL Certification UL 1777, UL 64, UL 441
Fuel Compatibility Wood, Oil, Coal, Gas, Pellet, Corn
Warranty Lifetime Transferable Warranty (Professional Maintenance Required)

Warranty

  • Limited Lifetime Warranty

Documents & Files

National Chimney M-Flex Chimney Liner | 6-Inch