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The genuine OEM Goodman 0128F00006 Chimney Transition Bottom is the factory flue vent adapter for the Amana/Goodman AMVC80603BXBD 80% AFUE gas furnace. This sheet-metal transition connects the furnace's induced-draft outlet to the chimney/vent connector, establishing the correct flue geometry so combustion byproducts vent safely and draft is maintained. A properly fitted transition is critical for spillage-free venting and to keep the pressure switch reading true draft.
OEM vs. Generic: Vent transitions are model-specific stampings. The genuine 0128F00006 matches the exact flange pattern and outlet diameter of this furnace, ensuring a sealed, code-compliant connection. Universal or hand-fabricated transitions risk leaks, poor draft, and pressure-switch faults, so OEM is the correct replacement here.
Install difficulty: Moderate (20–40 min). Requires shutting off power, disconnecting the existing vent, removing the old transition, and sealing the new one with high-temp sealant and screws. After installation, verify a tight seal and confirm proper draft/spillage with the burners running. When in doubt, have vent work performed by a licensed technician.