If your switch does not come with an installed power supply, you can install one or two power supplies.All installed power supplies must blow air in the same direction and must match the airflow direction of the installed fan modules.
To determine the airflow direction of the powers supplies in the switch, enter the following command from the command line (CLI):
show environment power
The Airflow environment variable identifies the direction of the airflow for the power supplies. Valid values include:
