NEC Express5800 User Manual page 373

6.
Remove the dummy cover from the fan box.
The dummy fan cover has locking mechanism with its rear face. While pushing the lock,
lift the dummy fan cover slowly to remove it.
7.
Insert the optional fan unit into the slot for additional rear fan.
Insert the groove of the optional fan unit along with the guide of the factory-installed rear
fan, and push it to the end.
8.
Install the fan box in the chassis.
Upgrading Your Server 9-35
Dummy fan cover
Factory-installed front fan
Optional fan unit
Factory-installed rear fan
Fan box