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The Goodman 0128F00006 chimney transition bottom is the sheet-metal flue-vent component that channels combustion byproducts from the furnace heat exchanger out toward the vent connector on the Goodman/Amana ACES800403AXAA and compatible 80% AFUE gas furnaces. A correctly seated transition maintains proper draft and a sealed flue path, preventing dangerous flue-gas spillage into the equipment cabinet.
This genuine OEM Goodman transition is stamped to the exact contour and dimensions of your furnace's collector box and vent outlet. Generic flat stock or universal fittings rarely seal correctly against the factory gasketing, which can create draft and condensation problems. The OEM part bolts in with no fabrication required.
Moderate — Involves removing the existing vent connection, swapping the transition, and re-sealing the flue path. Because it is part of the combustion venting system, a licensed HVAC technician should verify draft and check for spillage after installation. Plan 30–45 minutes.