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The Goodman 4053501S is a genuine OEM chimney/flue collar engineered for AMH81405DNAC gas furnaces and other compatible Goodman and Amana multi-position models. It seals the flue-vent connection between the furnace vent outlet and the venting system, maintaining proper draft and preventing flue-gas leakage. Because Goodman and Amana are sister brands built on the same platform, this OEM collar drops into either brand's furnace without modification.
The genuine OEM 4053501S matches the factory flue diameter and mounting geometry exactly, ensuring a leak-free draft seal. Generic collars often require field trimming and may not seat flush, risking flue-gas spillage. For a combustion-vent component, OEM fit is strongly recommended.
Moderate — requires disconnecting the vent pipe and sealing the collar to the furnace outlet. Any work on flue/venting affects combustion safety and should be performed by a qualified HVAC technician with a combustion analyzer.