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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component for the Amana/Goodman AMH80803BXBB 80% AFUE furnace. This sheet-metal transition channels combustion byproducts from the induced-draft blower into the vent connector, maintaining the correct draft path out of the appliance. A rusted, cracked, or ill-fitting transition can leak flue gases, disrupt draft, and trigger pressure-switch faults.
The OEM 0128F00006 is stamped to the exact dimensions and gasket line of this furnace cabinet, so it seals correctly against the collector box and vent. Universal transitions rarely match the flange pattern and can leave gaps that leak flue gases. For any flue-side part, use the factory OEM piece and confirm a gas-tight seal.
Moderate — shut down the furnace, disconnect the vent connector, remove fasteners, and swap the transition with a fresh gasket or approved sealant. A combustion/CO check after installation is essential.