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The Goodman 0128F00006 is a genuine OEM chimney transition bottom (flue/vent transition) for the AMS80805CXAC gas furnace and compatible Goodman/Amana 80% AFUE models. This formed sheet-metal transition channels combustion byproducts from the furnace's induced-draft outlet into the vent connector, maintaining correct draft geometry. A corroded, warped, or missing transition can cause draft problems, condensation, and unsafe flue-gas spillage.
The OEM 0128F00006 matches the exact stamped shape and mounting points so the flue seals and drafts as designed. Generic or fabricated transitions rarely match the contour precisely, risking leaks at the joints and improper venting. For a flue-gas component, OEM fit is a safety priority.
Intermediate. Shut down the furnace, disconnect the vent connector, remove fasteners/sealant, fit the new transition to the draft outlet, refasten, and reseal with approved high-temp material. A combustion analysis and draft check are recommended after installation. Best performed by a qualified HVAC technician.