Figure 9: Airflow Through The Chassis; Figure 10: Upper Fan Tray; Figure 11: Air Filter; Figure 12: Air Filter Tray - Juniper MX960 Hardware Manual

MX960 3D Universal Edge Router Hardware Guide
24
At the bottom rear of the chassis, there is an air intake for power supply cooling. Air flows
over the power supplies and is exhausted out the rear of the chassis through the smaller
air exhaust below the main exhaust.

Figure 9: Airflow Through the Chassis

The host subsystem monitors the temperature of the router components. When the
router 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 PEM.

Figure 10: Upper Fan Tray

Figure 11: Air Filter

Figure 12: Air Filter Tray

Copyright © 2017, Juniper Networks, Inc.