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This OEM chimney collar (flue-vent collar) provides the correct flue-outlet connection point on your Goodman/Amana AMH81155CXAA 80% AFUE furnace. It mates the furnace's induced-draft outlet to the single-wall or Type-B vent pipe, ensuring proper alignment and a secure, leak-resistant joint. A cracked, rusted, or missing collar can allow flue-gas leakage and disrupt draft — a safety concern that this exact-fit part resolves.
The OEM collar matches your furnace's flue-outlet diameter and screw pattern exactly, so it seats flat and seals properly. Generic collars often require trimming or force-fitting, which can distort the flange and compromise the vent seal. For a flue-gas component, correct fit is a safety issue — choose OEM.
Moderate (3/5). Vent work should be done carefully. Shut off power and gas, disconnect the vent pipe, remove the old collar's fasteners, install the new collar, and reconnect the pipe with proper screws and (where required) sealant. Verify draft after startup. Budget 30–45 minutes; when in doubt, use a licensed technician.