National Chimney M-Flex Pellet Insert Basic Liner Kit

The National Chimney M-Flex Pellet Insert Basic Liner Kit provides a reliable, high-performance venting solution for pellet stove inserts and pellet fireplace inserts. Designed for durability and efficiency, this UL-listed chimney liner kit features a premium 316 stainless steel flexible liner that offers excellent corrosion resistance and long-lasting performance in demanding heating applications. Complete with a stove adapter featuring an EZ clamp system and a top kit, this pellet venting kit ensures a secure, professional installation while helping optimize draft and appliance performance.

Engineered for both residential upgrades and new installations, the M-Flex Pellet Insert Basic Liner Kit simplifies the process of connecting your pellet appliance to an existing chimney. The high-quality stainless steel construction promotes safe and efficient exhaust ventilation, while the included components provide everything needed for a dependable chimney liner system. Ideal for homeowners, contractors, and installers, this pellet stove chimney liner kit delivers the safety, durability, and performance required for efficient pellet heating systems.

Features

• Premium 316 Stainless Steel Chimney Liner: Constructed from mill-certified .006" thick 316 stainless steel for superior corrosion resistance, durability, and long-term performance in pellet stove venting applications.
• UL 1777 Listed & Tested: Certified for safe use with pellet stoves, wood stoves, coal, oil, and gas-burning appliances, ensuring reliable and code-compliant chimney venting.
• Designed for Pellet Stove Inserts: Engineered specifically to improve the performance and efficiency of pellet fireplace inserts and pellet heating systems.
• EZ Clamp Stove Adapter Included: Features a convenient tool-free EZ clamp connection that creates a secure, airtight fit between the liner and stove or insert collar.
• Complete Pellet Venting Kit: Includes everything needed for installation:
  • 316 Stainless Steel Flexible Liner
  • EZ Clamp Stove Adapter
  • Rain Cap
  • 13" x 13" Top Plate
• Improves Heating Efficiency: Helps optimize draft performance, promote proper exhaust flow, and support efficient pellet stove operation.
• Corrosion & Moisture Resistant: Built to withstand chimney condensation, moisture, and harsh venting environments for dependable year-round performance.
• Flexible Stainless Steel Design: Durable yet flexible construction allows easier installation through existing masonry chimney systems.
• High-Temperature Performance: Engineered to handle demanding heating conditions while maintaining structural integrity and safety.
• Reduces Creosote & Vent Build-Up: Smooth stainless steel interior helps minimize residue accumulation and supports cleaner venting performance.
• Available in Multiple Sizes: Offered in 25-foot and 35-foot lengths and 3-inch or 4-inch diameters to accommodate a variety of pellet stove installations.
• Weather Protection Included: Rain cap and top plate help prevent water intrusion, debris entry, and weather-related chimney damage.
• Professional-Grade Chimney Relining Solution: Ideal for upgrading older chimney systems when installing a new pellet stove or insert.
• Safe & Reliable Pellet Stove Venting: Provides a dependable pathway for exhaust gases while supporting safe appliance operation.
• Compatible with Residential Heating Systems: Suitable for homeowners, contractors, chimney professionals, and pellet stove installers.
• Important Installation Note: A cleanout tee is not included and may be required by certain pellet stove or insert manufacturers. Always verify appliance venting requirements before installation.

Specifications

Warranty

• Limited Lifetime Warranty

Documents & Files

• Product Brochure
• Installation Guide