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The Goodman 0128F00006 Chimney Transition Bottom is the genuine OEM flue-vent transition component for the AMH80904BXCA gas furnace. This sheet-metal transition channels combustion byproducts from the furnace's induced-draft outlet into the vent connector, maintaining proper draft and a sealed flue path. A correctly fitted transition is essential for safe venting and for keeping flue gases out of the equipment space.
The OEM 0128F00006 is stamped to the exact flange pattern, offset, and diameter of the AMH80904BXCA vent outlet, so it seats flush and seals without field fabrication. Universal or shop-bent transitions rarely match the factory bolt pattern, risking flue leaks, poor draft, and condensate pooling. For a combustion-venting part, use the factory-specified piece.
Moderate (2/5). Requires removing the existing transition, transferring or renewing high-temp flue sealant/gasket, and re-securing with sheet-metal screws. Power and gas must be off. After install, verify draft and check for spillage at the draft hood/inducer with a combustion analyzer or smoke test. If you are not comfortable working on venting, have a licensed HVAC technician complete the job.