NETGEAR READYNAS 2120, READYNAS 3220, READYNAS 4220 - page 44

Maintenance
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NETGEAR ReadyNAS OS 6 Rack-Mount Storage Systems
8. Connect the replacement fan’s power connections.
If the system power is on, the hot-plug feature causes the fan to start immediately.
To replace a fan on a 3220 or 4220:
1. Remove the chassis cover.
For more information, see Access the Inside of the Storage System on page 40.
2. Disconnect the fan’s power connections.