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The Goodman 0128F00006 Chimney Transition Bottom is the genuine OEM flue/vent transition that routes combustion products from the heat-exchanger collector box into the venting system on your Amana AMVC81005CNBA gas furnace. This sheet-metal transition maintains proper draft and a sealed exhaust path, keeping flue gases contained and moving safely up the vent.
A vent transition must seal precisely to the collector box and induced-draft path. The OEM 0128F00006 is stamped to Goodman's exact flange and gasket geometry, so it seals the first time and maintains the draft the furnace was engineered for. Generic or fabricated transitions risk flue-gas leakage, poor draft, and pressure-switch faults.
Replacement involves shutting off gas and power, removing the inducer or collector-box hardware, and reseating the transition with proper high-temp gasket/sealant. Always leak-check the vent connection and confirm the pressure switch proves draft after service. Because this part handles flue gases, a licensed HVAC technician is recommended.