4" x 35' Aluminum Liner Kit

Details

Model: 2GACKIT0435
Manufacturer: Z-Flex
Series: Z-Flex Aluminum Gas Venting System
Part Number: 72977
Description: Aluminum Chimney Liner Kit, 4 in. Diameter x 35 ft. Length, for Category I Natural Draft Gas Appliances.

Product Overview

The Z-Flex 2GACKIT0435 Aluminum Gas Liner Kit is a UL-listed venting assembly designed for Category I natural draft gas-fired heating appliances and fireplaces. This flexible aluminum liner provides a corrosion-resistant, gas-tight venting path within existing masonry chimneys. The 4-inch diameter, 35-foot liner is engineered to maintain consistent draft performance under negative pressure operation, ensuring safe evacuation of combustion gases. The system simplifies retrofit applications while maintaining compliance with NFPA 54 (National Fuel Gas Code) and ANSI Z223.1 standards for natural draft venting installations.

Technical Specifications

• Manufacturer Part Number: 2GACKIT0435
• Alternate Part Number: 72977
• System Type: Flexible Aluminum Chimney Liner Kit
• Diameter: 4 inches (nominal)
• Length: 35 feet
• Material: Corrugated aluminum alloy
• Listing/Certification: UL Listed for Category I gas-fired appliance venting
• Application: Natural draft gas furnaces, boilers, water heaters, and fireplaces
• Category Compatibility: Category I (non-condensing, negative pressure systems)
• Excluded Applications: Not for use with Category II, III, or IV gas appliances; not suitable for systems producing condensation or corrosive exhaust
• Operating Pressure: Negative draft only
• Temperature Range: Rated for standard flue gas temperatures associated with atmospheric gas appliances
• Included Components: 35 ft aluminum liner, top termination, appliance connector, fasteners, and installation hardware
• Installation Type: Flexible liner for retrofit or new chimney venting installations
• Standards Compliance: NFPA 54 (National Fuel Gas Code) / ANSI Z223.1
• Environment: For indoor chimney use; designed for natural draft operation

Installation Notes

• Use exclusively with Category I natural draft gas-fired appliances.
• Inspect chimney structure prior to liner installation and remove any obstructions.
• Maintain continuous upward slope and proper termination height per code.
• Do not install in applications with condensing or corrosive flue gas conditions.
• Secure all joints, terminations, and fittings according to Z-Flex installation instructions.
• Verify airtight fit and system draft following installation completion.

Summary

The Z-Flex 2GACKIT0435 Aluminum Gas Liner Kit provides a UL-listed, flexible 4-inch by 35-foot venting solution for Category I natural draft gas heating systems. Constructed from corrosion-resistant aluminum and designed for code-compliant performance, this liner system ensures reliable flue gas discharge and long-term integrity in both retrofit and new chimney applications for professional HVAC installations.