To replace a fan on a ReadyNAS 4360 storage system:
1. Remove the chassis cover.
2. Pull up on the fan gently to remove it from the housing.
3. Insert the replacement fan into the housing.
4. Make sure that the four bumpers fit in their grooves.
5. Push the fan down to seat the fan and the fan power connections.
If the system power is on, the hot-plug feature causes the fan to start immediately.