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The Goodman 0128F00006 Chimney Transition Bottom is the genuine OEM venting component used on the ACEC800804BXAB and compatible Goodman/Amana gas furnace assemblies. It forms the lower transition between the heat exchanger collector box and the flue outlet, maintaining the correct draft path and a sealed, code-compliant vent connection. A worn, corroded, or warped transition can cause draft problems, nuisance pressure-switch lockouts, and flue-gas leakage — replacing it with the exact factory part restores proper venting.
OEM vs. Generic: This is the genuine Goodman component, stamped and coated to the original tolerances so it drops into place without modification. Generic or fabricated transitions often require trimming and can compromise the vent seal — the OEM part guarantees correct geometry and a tight, lasting fit.
Install Difficulty: Moderate — requires removing the venting connection and is best handled by an HVAC professional. Always shut off gas and power before servicing venting components.