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The Goodman 4053501S Chimney Collar is a genuine OEM flue/vent component engineered for the AMS80903BNAA 80% AFUE gas furnace. This collar forms the sealed transition between the furnace flue outlet and the vent connector, keeping combustion byproducts routed safely to the chimney. Using the factory part guarantees the correct diameter, flange pattern, and heat tolerance so your venting system stays code-compliant and leak-free.
Generic collars often vary in flange size and metal gauge, which can cause vent leaks or improper draft. This genuine Goodman OEM collar matches the furnace's factory dimensions exactly, preserving proper draft and your equipment warranty. For a combustion-venting part, exact fit is a safety issue — not just convenience.
Moderate — 2 of 5. Replacement involves disconnecting the vent connector and reseating the collar; basic hand tools are sufficient. Always shut off gas and power first, and verify proper draft after reassembly. If you are unsure about combustion venting, consult a licensed HVAC technician.