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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component for the ACVC800805CXAB gas furnace. This transition piece routes combustion byproducts from the furnace's induced-draft outlet into the venting system, maintaining a proper seal and draft path. A damaged, corroded, or ill-fitting transition can allow flue-gas leakage and trip the pressure switch.
As a factory OEM Goodman part, the 0128F00006 matches the exact dimensions and flange pattern of your furnace's vent outlet. Aftermarket transitions often require trimming or extra sealant and can compromise the draft seal. For venting integrity and code compliance, OEM is recommended.
Easy to Moderate — Typically secured with sheet-metal screws and high-temp sealant. Power down the furnace, disconnect the existing transition, and confirm a tight, leak-free seal. A combustion/draft check after install is advised.
Verify fitment against your furnace model and serial number before purchasing.