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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM venting component for the AMH80704BXCA gas furnace and compatible Goodman and Amana 80% models. This sheet-metal transition forms the bottom section of the flue collector-to-vent connection, channeling combustion byproducts from the heat exchanger into the chimney or vent pipe. A correctly fitted transition maintains proper draft and a sealed flue path, preventing flue-gas spillage into the equipment closet.
The OEM 0128F00006 is stamped to the exact dimensions and mounting hole pattern of this furnace's flue outlet, ensuring a leak-free fit that generic or field-fabricated transitions rarely match. An improper transition can restrict draft or leak combustion gases. For any flue-side part, the genuine OEM component is the safe, correct choice.
Moderate (3/5). With power and gas off, disconnect the existing vent connection, remove the fasteners securing the old transition, and mount the replacement using the factory holes and high-temperature sealant where specified. Allow 20–30 minutes. Because this part carries combustion gases, a licensed technician should perform a draft and spillage test before returning the furnace to service.