Lenovo Campus Series Installation Manual page 23

The figure below illustrates how to complete the rack-mount installation:
Use the rack-mount unit screws, cage nuts, and the additional screwdriver to fasten
the frontal rack-mount brackets onto the front of the rack-mount unit.
Note: Make sure that there is adequate space around the switch to allow for proper
airflow, ventilation, and cooling.
As a precaution, install the switch in a fairly cool and dry place within the
acceptable temperature and humidity operating ranges.
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