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This genuine OEM Goodman 0128F00006 chimney transition bottom is a direct-fit venting component for the AMVC800805CNAB 80% AFUE two-stage furnace. The transition bottom channels combustion flue gases from the heat exchanger collector into the vent connector, maintaining the correct draft path and a sealed exhaust route out of the appliance. A cracked, corroded, or improperly seated transition can cause flue-gas spillage and nuisance pressure-switch lockouts, so replacing it with the factory part protects both furnace operation and combustion safety.
The OEM 0128F00006 is stamped and formed to the exact flange dimensions of the AMVC8 cabinet, so it drops in and seals correctly the first time. Generic or universal transition pieces often require field trimming and extra sealant, and a poor seal here directly affects the pressure-switch signal. For a venting component, OEM fit is the safe choice.
Moderate — access requires opening the burner/vent area and removing a few sheet-metal screws. Always shut off gas and power first, verify a tight seal on reassembly, and confirm proper draft before returning the unit to service. If you are not comfortable working around the combustion path, use a licensed HVAC technician.