The switch is designed such that you can have coolant air flow through the switch in one of two directions:

• Enter the port side and exhaust out the power supply side (port-side intake airflow).

• Enter the power supply side and exhaust out the port side (port-side exhaust airflow).

For port-side intake airflow, the switch must have port-side intake fan and AC power supply modules with one or more of these colorings:

• Red coloring on fan modules and AC power supplies.

• Red coloring on 2000-W DC power supplies (power supplies with their airflow direction set by the fan modules).

• Red coloring on DC power supply is also used for port-side-intake air flow.

For port-side exhaust airflow, the switch must have port-side exhaust fan and AC power supply modules with one or more of these colorings:

• Blue coloring on fan modules and AC power supplies.

• Blue coloring on DC power supplies.

Plan the positioning of the switch so that its ports are located close to ports on connected devices or so that the fan and power supply modules are conveniently located in a maintenance aisle. Order the modules that move coolant air in the appropriate direction from the cold aisle to the hot aisle.