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The Goodman 4053501S is a genuine OEM chimney collar / flue vent component built as a direct-fit replacement for the AMH80903BNAA gas furnace. The collar connects the furnace draft-hood outlet to the vent pipe, ensuring combustion byproducts are drawn safely up the flue. A corroded, warped, or ill-fitting collar can leak flue gases and cause pressure-switch faults — using the correct factory part maintains a proper, code-compliant venting seal.
Because this part handles flue gases, exact fit is a safety matter. The OEM 4053501S matches the factory outlet diameter and mounting flange so the vent connection seats tight without gaps. Generic collars risk poor seals and back-drafting. For combustion venting, always choose the factory-spec part.
Easy–Moderate (2 of 5). Remove the vent pipe, swap the collar, reseal, and reconnect. Verify proper draft after installation. Shut off gas and power before servicing, and confirm no flue-gas leakage on startup.