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The Goodman 0128F00006 is a genuine OEM chimney transition bottom that routes flue gases from the furnace heat exchanger into the vent connector on the ADSS800804BXAC and compatible Goodman/Amana furnaces. This sheet-metal transition establishes a correctly shaped, sealed pathway for products of combustion so the furnace vents safely and draft is maintained. Damaged, rusted, or missing transitions can leak flue gases into the equipment room — a genuine OEM replacement restores a proper venting connection.
The OEM transition is stamped to match this cabinet's exact port location and clearances. Generic sheet-metal fabrications rarely seal correctly, risking flue-gas leakage and failed inspections. For a venting component, choose the genuine Goodman part.
Moderate — Requires removing fasteners, seating the transition to the heat exchanger collar, and re-sealing the vent connection. Confirm draft and check for spillage after install; a licensed technician is recommended.