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The Goodman 0128F00006 Chimney Transition Bottom is the factory sheet-metal vent adapter that connects the furnace flue collar to the chimney or vent connector on the ADSS801005CXAC gas furnace. It maintains the correct draft path and clearances for safe flue-gas evacuation. A corroded, crushed, or missing transition can leak combustion products or disrupt draft — replace with the OEM piece to preserve proper venting.
The OEM transition is stamped to the exact dimensions and hole pattern of your furnace's flue outlet, ensuring a leak-free, code-compliant fit. Field-fabricated or generic adapters risk gaps and improper draft. For flue-gas components, OEM is the safe choice.
Easy. Removes with a nut driver or screws and reinstalls in minutes. Ensure all flue joints are sealed and secured, and verify proper draft after reassembly. Turn off power and gas before service.