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 Diameter Length Material SKU 3" 25' 316 Stainless Steel CB325BK 3" 35' 316 Stainless Steel CB335BK 4" 25' 316 Stainless Steel CB425BK 4" 35' 316 Stainless Steel CB435BK Warranty Limited Lifetime Warranty Documents & Files Product Brochure Installation Guide
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