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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component for ACES800804BXAA gas furnaces and compatible Goodman/Amana 80% AFUE models. This sheet-metal transition routes combustion byproducts from the furnace's induced-draft outlet into the vent/chimney connector, maintaining a proper sealed path for safe exhaust. A corroded, dented, or mis-sealed transition can cause flue-gas leakage, condensation damage, and pressure-switch faults. Replacing it with the correct OEM piece restores a leak-free venting connection.
The genuine OEM Goodman transition is formed to the exact dimensions and flange pattern of the original, so it lines up cleanly with the inducer outlet and vent connector. Generic or field-fabricated pieces rarely seal correctly and can introduce dangerous flue leaks. For a venting component, OEM fit is essential for safety.
Moderate (3/5). Shut off power and gas, disconnect the vent connector, remove the sheet-metal screws, and replace the transition. Reseal all joints with approved high-temp sealant and verify proper draft. Best performed by an HVAC technician with combustion-safety testing.