If you have one of these nice portable Air conditioner you can get a new Fan Blower that the plastic keeper ring breaks see photo.
You can purchase it here as the model number of the fan is written on the blower.
A5304-450-AH-11 RepairClinic Item #2110503
Or customer service for Honeywell –
Suite 906, One International Blvd.,
Mahwah NJ 07495
Customer Support: +1 800 474 2147