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The Goodman 0128F00006 chimney transition bottom is a genuine OEM flue/vent component for AMS80804BXAC 80% AFUE gas furnaces. This sheet-metal transition connects the furnace's induced-draft outlet to the vent pipe or chimney connector, channeling combustion byproducts safely out of the home. A rusted, warped, or missing transition can leak flue gases and disrupt proper draft — replacing it with the correct OEM piece restores a tight, factory-spec vent path.
The OEM 0128F00006 is stamped to the exact dimensions and flange pattern of your furnace's vent outlet, ensuring a leak-free seal without field fabrication. Generic or universal transitions rarely line up cleanly and can leave gaps that compromise draft and safety. On a flue-gas component, the OEM fit is worth it.
Moderate — shut off power, disconnect the vent pipe, remove fasteners, and swap in the new transition with fresh high-temp sealant/gasket where required. About 30–45 minutes. Because this handles combustion gases, verify a proper draft and check for spillage/CO after reassembly. When in doubt, use a licensed HVAC technician.
Exact-fit OEM parts and fast shipping from NationalHVACParts.com.