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The Goodman 0128F00006 Chimney Transition Bottom is the OEM sheet-metal flue component that channels combustion gases from the furnace collector box into the vent connector. This exact-fit replacement is designed for the AMVC800603BNAA furnace, ensuring a proper seal and correct venting geometry so exhaust exits safely to the flue.
Flue transitions must match the furnace's collector-box opening and vent draft path precisely. The genuine OEM 0128F00006 is stamped to factory dimensions, so gaskets seat correctly and there are no exhaust leaks. Generic or fabricated substitutes risk gaps that leak carbon monoxide — not a place to compromise.
Moderate (2/5). Requires removing the vent connector and, on many units, the existing gasket. Shut off gas and power first. Because this part is part of the combustion venting path, verify a proper seal and confirm draft after installation; when in doubt, use a licensed technician.