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The Goodman 0128F00006 Chimney Transition Bottom is the genuine OEM venting component for the ACVC80603BXBC 80% AFUE two-stage gas furnace. This stamped sheet-metal transition seats at the base of the flue collector box and channels combustion byproducts into the chimney/vent connector, maintaining the correct draft path the furnace was engineered for. Using the factory part preserves the original flue geometry and clearances so your venting stays code-compliant and leak-free.
OEM vs. Generic: The genuine Goodman transition is dimensionally matched to the ACVC80603BXBC flue box and gasket pattern. Aftermarket substitutes often differ in flange spacing or depth, which can cause draft leaks, condensate pooling, or a failed inspection. For a combustion-venting part, exact fit is a safety matter — OEM is strongly recommended.
Install difficulty: Moderate — requires removing the existing transition, transferring or replacing the flue gasket, and confirming a tight, sealed connection. Furnace flue work should be performed by a qualified HVAC technician, and a combustion/draft check is recommended after reassembly.