DuraVent

DuraVent 20' Flex Pipe Length DuraFlex 316 Stainless Steel Basic Kit

$771.00
$771.00
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DuraVent 20' Flex Pipe Length DuraFlex 316 Stainless Steel Basic Kit

The DuraVent 20' DuraFlex 316 Stainless Steel Basic Kit is a premium flexible chimney liner kit designed for safe, efficient masonry chimney relining in residential and commercial applications. Manufactured from highly corrosion-resistant 316 stainless steel, this 20-foot chimney liner kit is ideal for wood-burning fireplaces, wood stoves, non-condensing gas appliances, oil-fired systems, and coal-burning appliances. Its lightweight, flexible construction simplifies installation in chimneys with minimal offsets while maintaining excellent draft and reliable flue gas performance. The system is UL 1777 and ULC S635 listed, providing trusted, code-compliant chimney venting.

Built for demanding venting environments, the DuraFlex 316 stainless steel chimney liner offers superior resistance to heat, moisture, and corrosive combustion byproducts, making it an excellent choice for coal-fired heating systems and long-term chimney protection. This 20-foot flexible chimney liner kit improves venting efficiency, protects masonry flues, and supports optimal appliance performance. Backed by DuraVent’s proven engineering, it delivers a durable and professional-grade solution for fireplace inserts, furnaces, boilers, and wood stove chimney liner installations.

Features

    • DuraVent 20' DuraFlex 316 Stainless Steel Basic Kit: Complete 20-foot flexible chimney liner kit designed for professional masonry chimney relining and reliable venting performance.
    • Premium 316 Stainless Steel Chimney Liner: Constructed with durable 316 stainless steel alloy for superior corrosion resistance, strength, and long-lasting protection against harsh flue conditions.
    • Available in Multiple Diameter Sizes: Offered in 3" to 8" diameters to support a variety of wood stoves, fireplace inserts, fireplaces, furnaces, boilers, and oil appliances.
    • Flexible Chimney Liner Installation: Designed to easily navigate chimney pathways with minimal offsets, allowing for smoother installation and improved venting efficiency.
    • Multiple Flex Length Options: Available in 15’, 20’, 25’, 30’, and 35’ lengths to accommodate different chimney heights and installation requirements.
    • Compatible with Solid Fuel & Non-Condensing Appliances: Ideal for solid-fuel, non-condensing gas, and oil-fired appliances, providing a versatile chimney venting solution.
    • Enhanced Corrosion Protection: The 316 stainless steel liner provides increased resistance for demanding applications, including coal-burning appliances and sulfur-rich fuel conditions.
    • Improves Chimney Draft & Efficiency: Helps optimize flue gas flow, restore chimney performance, and support efficient appliance operation.
    • Professional Chimney Relining Solution: Perfect for chimney liner replacement, fireplace insert installations, and wood stove vent upgrades.
    • UL Listed DuraFlex System: Part of the trusted DuraVent DuraFlex 316 series, designed for safe, code-compliant chimney relining applications.

    Specifications

    Model Size Flex Length
    3DF316-20K 3" I.D 20 ft.
    4DF316-20K 4" I.D 20 ft.
    5DF316-20K 5" I.D 20 ft.
    55DF316-20K 5.5" I.D 20 ft.
    6DF316-20K 6" I.D 20 ft.
    7DF316-20K 7" I.D 20 ft.
    8DF316-20K 8" I.D 20 ft.
    Materials 316 Stainless Steel
    Construction Single-Wall
    Clearance 0” clearance for gas, oil, and pellet applications.
    Clearance 1” clearance to masonry for wood-burning
    Listings Listed to UL 1777 and ULC S635 (MH45609).
    Warranty Limited-lifetime warranty

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