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The Goodman 4053501S Chimney Collar is a genuine OEM flue/vent component engineered for the AMH80905CXAA 80% AFUE gas furnace and compatible Goodman/Amana models. This collar forms the transition between the furnace flue outlet and the vent connector, ensuring a secure, properly sealed path for combustion byproducts to exit the appliance.
This is a factory OEM part built to exact furnace tolerances, so it seats correctly against the flue outlet without gaps that a universal collar can leave. Aftermarket generics may fit loosely and risk vent leakage; the OEM 4053501S guarantees a proper seal and long service life.
Easy — typically a bolt-on / press-fit replacement for a homeowner or technician. Always shut off power and gas before servicing and verify vent draft after installation.