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The Goodman 4053501S Chimney Collar is the genuine OEM flue-vent connection for AMH80903BXAA 80% AFUE furnaces. The collar transitions the furnace's draft-hood outlet to the vent connector pipe, holding the flue securely and maintaining the clearance that lets combustion byproducts vent safely up the chimney. A corroded or ill-fitting collar risks flue-gas spillage — a safety issue on any atmospherically vented appliance — so a correct factory part is essential.
The OEM collar matches the furnace's exact vent-outlet diameter and bolt pattern for a leak-free, code-compliant fit. Generic collars may require reshaping to seal properly — not advisable on a flue-gas component where a tight seal is a safety requirement. We recommend OEM here.
Easy (2/5). Shut off power and gas, disconnect the vent pipe, remove the old collar's fasteners, and mount the replacement. Reseal joints per local code and confirm proper draft. Typical time: 15–25 minutes.
After installation, verify draft with a smoke check or manometer to ensure no flue-gas spillage at the draft hood.