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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component engineered for the AMVC80603BNBC 80% AFUE two-stage variable-speed gas furnace and compatible Goodman/Amana models. This transition seats the base of the flue collector to the venting system, maintaining a proper draft path and preventing flue-gas leakage at the exhaust connection.
Choosing the OEM 0128F00006 guarantees exact flange geometry and gauge thickness, so the transition mates flush to the furnace cabinet and venting without gaps. Generic or fabricated substitutes often require field trimming and can create draft or condensation issues that trip the furnace on a pressure-switch fault. For a reliable, code-compliant vent seal, OEM is the safe choice.
Moderate — replacement involves accessing the vent connection, removing fasteners, and reseating the transition with proper sealant/gasketing. Allow 30–45 minutes and always confirm a tight vent seal before restoring power. Professional installation is recommended if you are not comfortable working around combustion venting.
Always disconnect power and shut off the gas supply before servicing any furnace component.