Figure 22: Airflow Through the Front Card Cage and Powerhouse
g050103
Front
Side view
Rear
Cooling for the rear card cage is also front to back. The air intake to cool the rear card
cage is located on the front sides of the chassis. Cool air is pulled in through the side fan
trays. The hot air exhausts through the rear card cage. See Figure 23 on page 47 for this
airflow.
Figure 23: Airflow Through the Rear Card Cage
NOTE: Do not block the air intake at the bottom front of the chassis, or the
side fan trays.
The Control Board monitors the temperature of device components. Under normal
operating conditions, the fans in the fan trays run at less than full speed.
If the chassis temperature rises above the acceptable threshold the speed of the working
fans is automatically adjusted to keep the temperature within the acceptable range. If
47Copyright © 2012, Juniper Networks, Inc.
Chapter 3: QFX3008-I Overview
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