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The Goodman 0128F00006 Chimney Transition Bottom is the genuine OEM flue-venting component for VMS80804BXAA 80% gas furnaces and compatible Goodman/Amana models. This sheet-metal transition connects the furnace's induced-draft outlet to the vent connector, shaping the flue path so combustion gases are drawn cleanly out of the heat exchanger. A corroded, warped, or missing transition disrupts draft, risks flue-gas spillage, and can trip the pressure switch — installing the correct OEM piece restores a proper vent seal and reliable draft proving.
The OEM Goodman transition is stamped to match the exact bolt pattern, gasket seat, and outlet diameter of your furnace's draft assembly. Generic or fabricated panels rarely seal correctly, leading to draft leaks and pressure-switch faults. Because this part carries combustion products, the exact OEM fit is essential for a safe, tight vent connection.
Rated 2.5 of 5. Cut power, disconnect the vent connector, and remove the screws securing the old transition and its gasket. Fit the new panel with a fresh high-temp gasket, reseal, and reattach the vent. About 20 minutes with a nut driver. Perform a combustion/spillage check at the draft hood after start-up. Venting work is best verified by a licensed HVAC technician.