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The Goodman 0128F00006 is a genuine OEM chimney transition bottom for the Amana/Goodman AMH80803BXBD 80% AFUE gas furnace. This sheet-metal transition mates the furnace's induced-draft outlet to the vent connector, directing flue gases into the chimney with the correct geometry for proper draft. A missing, rusted, or ill-fitting transition can cause flue-gas spillage, condensation, and draft-proving failures at the pressure switch.
Generic transitions rarely match the exact flange pattern and outlet diameter of this furnace, forcing field fabrication and risking leaks at the seams. This OEM transition is stamped to Goodman's original dimensions for a leak-tight, code-compliant vent connection and preserves the factory draft path.
Easy — with power and gas off, remove the existing transition screws, seat the new part on the draft outlet, and fasten with sheet-metal screws and approved sealant. Verify draft and check for spillage after startup.