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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent transition panel for AMH81005CXBD gas furnaces and compatible Goodman/Amana models. This stamped component forms the lower section of the flue transition where combustion gases collect above the heat exchanger and route into the vent connector. A rusted, warped, or gasket-failed transition can leak flue products, so an exact-fit replacement is important for safe venting.
Flue transition parts must seal precisely against the furnace cabinet and vent collar. OEM 0128F00006 has factory-correct dimensions and mounting-hole placement, ensuring a leak-free fit. Generic or fabricated panels rarely match the flange geometry, risking flue-gas spillage. For a vent-path component, OEM fit is the safe choice.
Moderate — Shut off gas and power, disconnect the vent connector, remove fasteners, and replace any high-temp gasket during reassembly. Verify a tight seal and perform a combustion/draft check after installation. Professional service is recommended for any flue-related repair.