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The OEM Goodman 0128F00006 Chimney Transition Bottom is a factory venting component for the Goodman/Amana AMVC81005CNBB gas furnace. This transition adapts the furnace's flue outlet to the vent connector, providing a sealed, correctly sized path for combustion byproducts to exit the cabinet. A properly fitted OEM transition maintains the draft characteristics the furnace was certified with and prevents flue-gas leakage into the equipment space.
This genuine OEM transition is stamped to the exact dimensions and gauge of the original, so it seats cleanly against the flue outlet without gaps. Field-fabricated or generic substitutes rarely match the flange geometry and can leak or restrict venting. For a combustion-venting part, OEM fit matters.
Easy–Moderate (2/5). Fastens with sheet-metal screws and should be sealed at the joints per code. Shut off power before servicing and confirm proper draft after reassembly. Any venting work should follow local mechanical code and manufacturer instructions.