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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue-venting component for the AMS80403AXAC 80% AFUE gas furnace and related Goodman and Amana models. This stamped-steel transition panel forms the bottom of the flue collector connection, routing combustion gases from the heat exchanger into the vent pipe while maintaining the correct draft and clearances designed into the furnace.
Flue components are dimensionally specific — even small differences in flange size or hole pattern create leaks that let flue gas escape. This genuine Goodman OEM panel matches the factory stamping exactly, so it seals to the collector box and vent connector without modification. There is effectively no reliable generic equivalent for this transition piece; OEM is the safe choice.
Easy to Moderate (2/5). Shut off gas and power, disconnect the vent pipe, remove the mounting screws, and replace the panel — resealing with high-temp gasket or sealant where the factory used it. Confirm a tight vent connection and verify proper draft before returning the furnace to service. A CO check afterward is strongly recommended.
Genuine OEM replacement, in stock and ready to ship.