Ventilation Considerations - Cisco ASR 5000 Installation Manual

Ventilation Considerations

Ventilation Considerations
Airflow within the system is designed per Telcordia recommendations to ensure the proper vertical convection
cooling of the system.
As shown in the figure below, the lower fan tray pulls ambient air inward from the front and side intake vents
located at the bottom of the chassis. The air is pushed upwards through the system and absorbs heat as it
passes over system components.
Total air flow exiting the chassis is approximately:
• 275CFM (7.8 cubic meters/minute) – Low fan speed
• 565CFM (16 cubic meters/minute) – High fan speed
The upper fan tray pulls the heated air up through the chassis. The heated air exits through the side and rear
exhaust vents located at the top of the chassis.
Figure 23: System Airflow and Ventilation
Proper ventilation and cooling must allow the chassis to operate within the temperature and humidity levels
described in the following table.
ASR 5000 Installation Guide
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Chassis Installation