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The Goodman 0128F00006 Chimney Transition (Bottom) is a genuine OEM flue-vent transition piece for AMH80805CNBA gas furnaces. This bottom transition connects the furnace's induced-draft / vent outlet to the chimney or vent connector, forming a properly sized path for combustion byproducts. A corroded, warped, or mismatched transition can cause flue-gas leakage, poor draft, and pressure-switch faults, so a correct-fitting OEM part is important for safe venting.
The genuine OEM 0128F00006 matches the factory flange dimensions and hole pattern so it seals cleanly against the cabinet and vent connector. Generic or shop-fabricated transitions risk gaps and improper draft, which on a combustion appliance can allow flue-gas spillage. OEM is the recommended choice for venting components.
Moderate (3/5). Requires disconnecting the vent connector, removing the old transition, and resealing the new one with high-temperature sealant and fasteners. Improper venting is a carbon-monoxide hazard — this repair should be performed by a licensed HVAC technician and verified with a combustion / draft check.