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The Goodman 0128F00006 Chimney Transition Bottom is the genuine OEM flue/venting component for the AMH80603ANBA 80% AFUE gas furnace and compatible Goodman/Amana models. This stamped-metal transition directs flue products from the furnace collector/induced-draft outlet into the vent connector, maintaining a proper seal and draft path so combustion gases exit safely to the chimney.
Flue transitions are model-specific in their bolt pattern and dimensions. The OEM 0128F00006 drops in without cutting or fabricating and mates cleanly to the factory gasket surface. Universal sheet-metal substitutes rarely seal correctly, risking flue-gas leakage — never worth the compromise on a combustion part.
Rating: Easy–Moderate (2/5). Remove the vent connector, unfasten the old transition, and reinstall with the original gasket (order gasket 0154F00003 if worn). Verify draft after reassembly. Shut off power and gas before servicing.