Juniper EX4400 - Page 206

WARNING: To prevent injury, do not touch the fan with your hands or any tools as you
slide the fan module out of the chassis—the fan might sll be running.
4. Grasp the handle on the fan module and pull it rmly to slide the fan module out of the chassis (see
Figure 111 on page 198).
Figure 111: Remove a Fan Module from the EX4400 Switch
5. Place the fan module in the anstac bag or on the anstac mat placed on a at, stable surface.
CAUTION: Do not mix:
• Fan modules with dierent airow direcons in the same chassis.
• Power supplies and fan modules with dierent airow direcons in the same
chassis.
If you install power supplies or fan modules with dierent airow direcons, Junos OS
raises an alarm.
6. Install the replacement fan.
NOTE: You must install all the fan modules and they must be operaonal for opmal
funconing of the switch.
198