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The Goodman 0128F00006 is a genuine OEM chimney transition bottom for the ACES800603AXAA gas furnace and compatible Goodman/Amana 80% AFUE models. This stamped vent component forms the lower transition between the furnace flue collector and the vent pipe / chimney connector, directing combustion byproducts safely out of the cabinet. A rusted, warped, or missing transition can leak flue gases or break the proper draft path — replacing it with the factory part keeps venting sealed and code-compliant.
The genuine OEM transition matches the furnace's flue opening dimensions and bolt pattern exactly, ensuring a leak-free seal. Generic or fabricated substitutes rarely line up correctly and risk flue-gas spillage. For a venting part, OEM fit is essential to safe operation.
Easy (2/5). Power down the furnace, remove the screws securing the existing transition, transfer any gasket/sealant, and fasten the replacement. Roughly 20 minutes. Confirm a tight seal and proper draft before returning the furnace to service.