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The Goodman 4053501S Chimney Collar is a genuine OEM flue-vent component for the AMH80905CNAA 80% AFUE gas furnace. This collar provides the sealed transition between the furnace flue outlet and the vent pipe/chimney connector, ensuring combustion byproducts are drawn safely up the vent. A corroded, warped, or missing collar can allow flue-gas leakage and poor draft — replacing it with the correct OEM part restores a safe, sealed venting path.
OEM collars match the furnace flue opening exactly for a leak-free seal and proper draft. Generic substitutes may not seat correctly, risking flue-gas escape and code violations. For a critical safety component like venting, OEM is strongly recommended.
Moderate (2/5). Shut off power and gas and confirm the furnace is cool. Disconnect the vent pipe, remove fasteners, swap the collar, and re-seal the vent connection. Verify proper draft after install. Typical time: 30–45 minutes. If unsure about venting, consult a licensed technician.