Cisco Nexus 9300-FX Hardware Installation Manual page 14

Overview
Overview
The fan and power supply modules are field replaceable. You can replace one fan module or one power supply
module during operations, so long as the other modules are installed and operating. If you have only one
power supply installed, you can install the replacement power supply in the open slot before removing the
original power supply.
Note
All of the fan and power supply modules must have the same direction of airflow. Otherwise, the switch can
overheat and shut down. If you are installing a dual-direction power supply, that module automatically uses
the same airflow direction as the other modules in the switch.
Caution If the switch has port-side intake airflow (burgundy coloring for fan modules), you must locate the ports in
the cold aisle. If the switch has port-side exhaust airflow (blue coloring for fan modules), you must locate the
ports in the hot aisle. If you locate the air intake in a hot aisle, the switch can overheat and shut down.
Cisco Nexus 9348GC-FXP ACI Mode Hardware Installation Guide
4