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The Goodman 0128F00006 chimney transition bottom is a genuine OEM flue/vent component designed for the AMVC80603BNBD gas furnace. It provides the sealed transition between the furnace flue collector and the vent connector, ensuring combustion byproducts are safely channeled to the chimney or vent system. A cracked, corroded, or missing transition can allow flue-gas leakage — making this an important part to keep in factory condition.
This factory transition is stamped to the exact dimensions of the AMVC80603BNBD flue path, so it seats and seals correctly the first time. Generic or fabricated substitutes rarely match the flange pattern and can create leak paths that fail combustion-safety inspection. OEM is strongly advised for any venting component.
Moderate (3/5). Requires removing the flue connection, seating the transition, and resealing with high-temp materials. Power and gas must be off. Plan 30–45 minutes; because it affects venting safety, professional installation and a combustion/CO check are recommended.