Juniper SRX5400 Hardware Manual page 41

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Figure 7: Airflow Through the Chassis
The host subsystem monitors the temperature of the services gateway components. When the device is
operating normally, the fans function at lower than full speed. If a fan fails or the ambient temperature
rises above a threshold, the speed of the remaining fans is automatically adjusted to keep the temperature
within the acceptable range. If the ambient maximum temperature specification is exceeded and the system
cannot be adequately cooled, the Routing Engine shuts down the system by disabling output power from
each power supply.
Figure 8: Fan Tray