Power Supply Airflow Direction Requirements

All installed power supplies must blow air in the same direction and must match the airflow direction of the installed fan modules.

A power supply with a red tab provides front-to-back airflow for power supply cooling. The power supply is labeled Air Out.
A power supply with a blue tab provides back-to-front airflow for power supply cooling. The power supply is labeled Air In.

Note

The operating-system software displays the airflow direction.

Warning

To prevent an electrical hazard, make sure that the AC power cord is not connected to the power supply before you install the power supply in the power supply slot.

Warning

Make sure that the AC power supply circuit is not overloaded. Use proper over-current protection, such as a circuit-breaker, to prevent over-current conditions.