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The Goodman 4053501S is a genuine OEM chimney (flue/vent) collar for the AMH80905CNAC gas furnace. The collar mounts to the furnace vent outlet and provides the transition point where the flue pipe connects, ensuring combustion gases are routed safely and are properly sealed against leakage. A damaged or missing collar can compromise draft and allow exhaust to escape into the equipment space.
A generic collar may not match the AMH80905CNAC's outlet diameter or mounting holes, leading to a loose fit and potential flue-gas leaks. This OEM Goodman collar matches the factory outlet exactly for a secure, correctly sealed vent connection.
Easy–Moderate (2/5) — Fastens with sheet-metal screws to the vent outlet; the flue pipe then connects to the collar. Ensure a tight, leak-free seal and inspect the venting per code. Power and gas off before servicing; professional installation recommended for any venting work.