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The 0128F00006 is the genuine Goodman chimney transition bottom designed for the ACVC800603BXAA 80% AFUE gas furnace and compatible Goodman/Amana variable-speed models. This sheet-metal transition seats at the base of the flue collector box and directs combustion byproducts into the vent connector, maintaining the proper draft and seal the furnace was engineered for. Using the exact OEM part keeps your venting code-compliant and avoids the gaps and rattles that aftermarket fabrications can introduce.
This is a factory Goodman component — a direct, drop-in replacement with the correct flange geometry and bolt pattern. Generic transitions often require trimming and extra sealant to fit, which risks flue leaks. For a venting component, OEM fit is the safe choice.
Easy (1 of 5). Replacement takes most homeowners 15–30 minutes with a nut driver and a screwdriver. Always shut off gas and power first, and inspect the vent connection for proper draft after reassembly. If you are unsure about combustion venting, have a licensed HVAC technician verify the install.