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The Goodman 4053501S is a genuine OEM chimney (flue) collar built as a direct replacement for the Goodman/Amana AMH80704BXAA gas furnace and compatible 80% AFUE models. The chimney collar is the sheet-metal transition that connects the furnace's induced-draft outlet to the vent pipe, ensuring flue gases are captured and safely carried up the chimney. A corroded, warped, or missing collar can allow flue-gas leakage and poor draft — a safety-critical concern — so a proper-fitting replacement is essential.
The OEM collar is the factory-original part with the exact flange and diameter for a leak-free vent connection. Our Generic equivalent matches the fit at a lower cost. For flue and venting components, OEM is strongly recommended because a proper seal is a combustion-safety requirement.
A modest repair for a careful DIYer. Cut all power, disconnect the vent pipe, remove the old collar's fasteners, and mount the new collar with a proper high-temperature seal. Verify draft and check for flue-gas spillage after startup. If you are not confident testing draft safely, hire a licensed HVAC professional.