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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component engineered for the AMVC81005CNBC 80% AFUE two-stage variable-speed gas furnace. This transition piece seats at the base of the vent connection and channels combustion byproducts safely into the flue, maintaining the sealed draft path the furnace was certified with. Using the exact factory part preserves proper venting geometry and avoids the leaks or backdraft risk that come with makeshift substitutes.
OEM vs. Generic: The genuine Goodman part matches factory dimensions and flange spacing exactly, so it seals to the heat exchanger collar and vent pipe without modification. Generic transitions often require trimming or extra sealant and are not certified for this venting system. For a combustion-side component, OEM is the safe choice.
Install difficulty: Moderate — requires removing the vent connector and inspecting gaskets. Best handled by a qualified HVAC technician. Always shut off gas and power before servicing.