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The HART COOLEY 6eft is a tall roof flange designed for 6-inch Type B gas vent systems. It seals the penetration point where a B-vent pipe exits through a roofline, providing a weathertight barrier that keeps moisture and outside air from entering the structure. This flange is rated for flat roofs through low-slope applications up to a 1/12 pitch. At 3.10 pounds, it is a manageable single-technician install. HVAC technicians and gas appliance installers place this component as part of a compliant venting assembly on naturally drafted gas appliances such as furnaces, boilers, and water heaters.
This roof flange is suited for residential and light commercial installations where a 6-inch B-vent system terminates through a low-slope or flat roof. The tall design provides additional clearance above the roof deck, which supports proper draft and helps meet vent termination height requirements. It is typically installed during new construction or as a replacement when an existing flange shows weathering, cracking, or seal failure.
Designed as an OEM-style replacement or new-installation component for 6-inch Type B gas vent systems on flat to 1/12 pitch roofs.
Installation should be performed by a licensed HVAC technician or qualified gas appliance installer in accordance with the International Fuel Gas Code (IFGC) and the appliance manufacturer venting instructions. Shut down and allow the venting system to cool completely before beginning any roof flange work. Ensure the roof penetration opening is correctly sized for the 6-inch vent pipe and that flashing and sealant are applied per local building code requirements. Do not compress or distort the flange during fastening, as this can compromise the weathertight seal.
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