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The Goodman 0128F00006 Chimney Transition Bottom is the genuine OEM flue vent component for the ACEC800804BXAA gas furnace and compatible Goodman/Amana 80% AFUE models. This transition piece forms the lower connection between the furnace vent outlet and the chimney/vent connector, channeling flue gases safely out of the heat exchanger area. A correctly sealed transition is essential for proper draft and safe combustion-byproduct evacuation.
This is a genuine Goodman OEM part, stamped and formed to the exact dimensions of the factory vent opening. Generic or universal transitions often require trimming and rarely seal flush, risking flue gas leakage. For a venting component, exact OEM fitment is the safest choice.
Moderate — requires shutting off gas and power, removing the existing vent connection, and properly seating/sealing the new transition. We recommend a qualified HVAC technician verify draft after install.