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The Goodman 4053501S Chimney Collar is a genuine OEM flue/vent component engineered as a direct-fit replacement for the AMH80703AXAA gas furnace. The collar seats between the furnace vent outlet and the flue pipe, maintaining a proper, leak-free connection that ensures safe combustion-byproduct venting and correct draft. A degraded or corroded collar can allow flue-gas leakage, so replacing it with the exact factory part protects both appliance performance and occupant safety.
The genuine Goodman collar is stamped to the exact vent-outlet diameter and hole pattern of the furnace, so it drops in without modification and maintains the manufacturer's certified venting clearances. Universal or generic collars often require field-fitting and may not hold a proper seal at high flue temperatures, which risks draft problems and safety-inspection failures. For a furnace vent component, OEM is strongly recommended.
Easy (1/5). Replacement typically requires disconnecting the flue pipe, swapping the collar, and re-securing with sheet-metal screws. No specialized tools beyond a nut driver are needed. Always shut off gas and power before servicing, and have a qualified technician verify draft after any flue work.