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The genuine Goodman 0128F00006 Chimney Transition Bottom is the OEM flue-vent adapter for the ADVC80603BNBB gas furnace. This transition piece connects the furnace's induced-draft outlet to the vent pipe, channeling combustion byproducts up the chimney. A corroded or ill-fitting transition can leak flue gases into the equipment space, so an exact-fit OEM replacement is essential for safe venting.
OEM vs. Generic: The Goodman transition is formed to the precise flange pattern and outlet diameter of this furnace's draft system, ensuring a tight, gasket-ready seal. Generic or hand-fabricated adapters frequently leave gaps that leak flue gas or restrict draft, tripping the pressure switch. OEM guarantees a proper seal and rated draft.
Install difficulty: Moderate. Requires disconnecting the vent connection, transferring gaskets, and re-sealing per code. A combustion/spillage check after installation is strongly recommended. Shut off gas and power before servicing, and verify there is no flue-gas spillage on startup.