Lenovo ThinkPad Edge E525 - Manual (Page 29)

For details, refer to the instructions in “Access Connections” on page 21.
2 Fan louvers (rear)
The internal fan and louvers enable air to circulate in the computer and cool the CPU.
Note: To avoid impeding airflow, do not place any obstacle in front of the fan.
Status indicators
The status indicators show the current status of your computer.
Chapter 1 . Product Overview 11