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The Goodman 0128F00006 Chimney Transition Bottom is a factory-original venting component for the Goodman/Amana AMH81005CXBB gas furnace and compatible 80% AFUE models. This stamped-steel transition piece connects the furnace's induced-draft / flue outlet to the vent pipe, forming the sealed bottom section of the flue transition so combustion byproducts are safely carried to the chimney or vent stack.
Venting components must match the furnace's exact outlet dimensions and gauge to maintain a proper draft seal. The OEM 0128F00006 is stamped to factory tolerances and lines up with existing screw holes and gaskets. Fabricated or generic substitutes risk flue leaks — a combustion-safety concern — so OEM is strongly preferred for any flue part.
Easy (1/5). Remove the sheet-metal screws, lift out the old transition, and seat the replacement with the factory gasket and fasteners. Confirm a tight, leak-free vent connection and check draft after reassembly. Shut off gas and power before servicing.