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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent transition piece for the AMH81005CNBB 80% AFUE gas furnace and compatible Goodman/Amana models. This sheet-metal transition adapts the furnace's induced-draft outlet to the vent connector/chimney flue, channeling combustion byproducts safely out of the appliance. A properly fitted transition maintains correct draft and prevents flue-gas spillage into the equipment area.
Corrosion, rust-through, or a crushed or ill-fitting transition can cause draft problems, condensation, and unsafe venting. Replacing it with the correct OEM part restores a tight, code-compliant venting path.
OEM vs. Generic: The genuine Goodman 0128F00006 is formed to the exact collar dimensions and bolt/screw pattern of this furnace's draft outlet, ensuring a leak-tight seal and proper draft geometry. Generic or shop-fabricated transitions may not seal correctly, risking flue-gas leakage. Because this component handles combustion exhaust, the exact-fit OEM part is the safe choice.
Install difficulty: Moderate (3/5). Shut off power and gas and allow the vent to cool. Remove the fasteners securing the old transition, detach it from the draft outlet and vent connector, and install the replacement with proper sealant/screws. Basic hand tools required. After installation, verify proper draft and check for spillage at the draft hood before returning the furnace to service.