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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component for AMS80604BXAA 80% AFUE furnaces and compatible Goodman/Amana models. This transition piece connects the furnace's induced-draft vent outlet to the chimney or B-vent flue pipe, ensuring combustion byproducts are routed safely out of the home. A properly-fitted OEM transition maintains the correct draft path and gasket seal, preventing flue-gas leakage and condensation problems.
The OEM Goodman transition is formed to the exact flue-collar dimensions and screw pattern of this furnace cabinet, so it seats squarely and seals correctly. Generic sheet-metal adapters may require modification and can leave gaps that compromise venting. For a flue-gas component, correct fit is a safety matter and the OEM part is recommended.
Moderate. Replacement involves disconnecting the vent pipe and removing the existing transition, then sealing the new piece with high-temperature fasteners. Shut off power and gas, and verify a proper draft after reassembly. Estimated time: 30–45 minutes. Venting work should be confirmed by a licensed HVAC technician.