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The Goodman 0128F00006 is a genuine OEM chimney transition bottom used on the AMVC80804CNCA gas furnace and compatible Goodman/Amana models. This flue/vent component forms the sealed transition between the furnace exhaust outlet and the vent connector, directing combustion byproducts safely into the chimney or vent pipe. A corroded, warped, or missing transition can leak flue gases, disrupt draft, and create a carbon monoxide hazard, so a correct-fitting OEM part is important for safe venting.
Flue transitions must match the furnace outlet flange and vent diameter exactly to seal properly and maintain draft. The OEM part is stamped to Goodman's factory dimensions and gasket pattern, while generic adapters may fit loosely and leak. For a combustion-venting component, OEM is the safe choice.
Moderate (3 of 5). Requires removing sheet-metal screws, cleaning old sealant, seating the new transition squarely, and re-sealing the joints per code. Shut off power and gas, verify a tight seal, and check for proper draft and no spillage after restart. When in doubt, use a licensed HVAC technician.