The switch fan module has a single reversible dual fan unit. When the fan unit is properly seated, the airflow indicator arrow is completely visible as shown in callout 1, Reversing the Fan Module Airflow. The airflow indicator arrow points in the direction the fan unit flows air through the fan module.
In the I/O port to power supply module (default) airflow configuration, the fan unit is visible (as shown in Removing the Switch Fan Module, callout 4).
When the fan unit is reversed, a metal plate covers the fan unit (as shown in Reversing the Fan Module Airflow).
To reverse the fan module airflow, follow these steps:
| 1 = Airflow indicator arrow | 3 = Airflow indicator arrow |
| 2 = Fan unit in mid-reversal | 4 = Fan screen |
Callout 1 shows airflow from the I/O port side to the power supply side of the module.
Callout 3 shows airflow from the power supply side to the I/O port side of the module.
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