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The Goodman 0128F00006 chimney transition bottom is a genuine OEM flue/vent component engineered for the AMH80804BNBC gas furnace and compatible Goodman/Amana models. It routes combustion gases from the heat exchanger collar into the vent system, maintaining a proper seal so exhaust vents safely to the flue. A cracked, corroded, or missing transition can cause draft problems, nuisance pressure-switch lockouts, and spillage of flue products.
This genuine OEM transition matches the exact stamping, collar diameter, and gasket seat of the original part, so it seats correctly the first time. Universal generic sheet-metal transitions often require trimming and rarely align with the factory vent collar, risking leaks. For a venting component, OEM fit is the safe choice.
Easy (1/5). Shut off power and gas, remove the old transition, and secure the replacement with the original screws and sealant. A qualified HVAC technician should verify draft and check for spillage after any vent work.