The power supply and fan assemblies are identified by the following airflow directions:
Intake power supply and fan assembly with an orange "I" label or without any label: Pulls air from the nonport-side of the switch and exhausts it out the port side.
Nonport-side air intake
Port-side air exhaust
Back-to-front (nonport-side to port-side) airflow
Part numbers ending with
-R
Exhaust power supply and fan assembly with a green "E" label: Pulls air from the port side of the switch and exhausts it out the nonport-side.
Nonport-side air exhaust
Port-side air intake
Front-to-back (port-side to nonport-side) airflow
Part numbers ending with
-F
You can check the top view of the switch to
ensure proper groove alignment:
