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The Goodman 4053501S Chimney Collar (vent collar) is a genuine OEM part for the Goodman GMP100-3 gas furnace. The chimney collar is the transition fitting that connects the furnace draft hood or flue outlet to the vent pipe, providing a secure, properly sized coupling for combustion gases exiting the appliance. A corroded, loose, or mismatched collar can leak flue gas and disrupt draft, so an exact-fit replacement matters.
This factory collar matches the GMP100-3 flue outlet diameter and mounting exactly, so it seats and seals without rework. Generic vent collars often differ in diameter or flange pattern, forcing improvised sealing that can leak. For any part in the combustion-vent path, OEM fit is the reliable choice.
Easy to Moderate — accessible at the furnace flue outlet and secured with standard fasteners, but it is part of the venting system. A qualified technician should verify the vent connection and draft after installation.
Always shut off gas and power before servicing. Contact info@nationalhvacparts.com with your model and serial number if you need help confirming fitment.