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Installation Note for Fan Tray Assemblies in
Catalyst 4500 Series Switches
Fan Assembly Overview
Note For complete environmental specifications, including airflow requirements, refer to Appendix A,
“Specifications,” in the Catalyst 4500 Series Installation Guide. The guide is available online at
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/installation/guide/78-14409-08/
4500inst.html
The system fan assembly provides cooling air for the internal chassis components. The fan assembly is
a tray of fans that you can insert and remove from the chassis while the system is on line. The
Catalyst 4503 fan assembly has two fans, the Catalyst 4506 fan assembly has four fans, and the
Catalyst 4507R fan assembly has six fans. The fans draw in fresh air from one side and exhaust air on
the other side. Catalyst 4503 airflow is shown in Figure 1. Catalyst 4506 airflow is shown in Figure 2.
Catalyst 4507R airflow is shown in Figure 3.
Caution You must install module filler plates on unused switching module slots to ensure proper airflow.
Caution Removing and replacing fan trays produced between September 2002 and November 2002 might require
rebooting the switch in a Catalyst 4506 switch with a Supervisor Engine III or Supervisor Engine IV and
in a Catalyst 4507R switch with Supervisor Engine IV. Starting in December 2002, Cisco added a white
strip on the bottom of the fan tray label to identify improved fan trays that do not have this limitation.