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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component for the Goodman/Amana ACEC800603AXAB furnace. This sheet-metal transition channels hot combustion gases from the heat exchanger collector into the draft hood and vent connector, maintaining proper draft and a sealed flue path. A corroded or ill-fitting transition can leak flue gases and disrupt venting — replacing it with the correct OEM part restores a safe, factory-tight connection.
This OEM transition is stamped to the exact dimensions and gasket pattern of your furnace's vent opening. Generic or fabricated substitutes rarely seal correctly, risking flue-gas leakage. For any venting component, an exact OEM fit is the safe choice.
Involves removing fasteners and the existing transition, then resealing the new part with the proper gasket or high-temp sealant. Because it affects combustion venting, a draft and spillage test should follow installation. Disconnect power and gas before servicing; when in doubt, use a licensed technician.