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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component for AMS80603AXAB gas furnaces and compatible Goodman/Amana models. This transition piece connects the induced-draft blower outlet to the furnace's vent path, routing combustion byproducts toward the chimney or vent connector. A correctly fitted transition maintains proper draft and a sealed exhaust path, which is essential for both efficiency and safe removal of flue gases.
OEM vs. Generic: Flue components must match the furnace's exact geometry and gasket points to prevent flue-gas leakage. The OEM 0128F00006 is stamped to Goodman's original dimensions and seals to the mating parts as designed. Fabricated or generic substitutes risk gaps, poor draft, and CO spillage. For any exhaust-side part, OEM is the safe choice.
Install difficulty: Easy to moderate (2/5). Power down, remove the fasteners securing the old transition, transfer any gaskets or hardware, and seat the replacement. Verify a tight, sealed vent connection before operating.