Figure 26: Airflow Through The Front Card Cage And Powerhouse; Figure 27: Airflow Through The Rear Card Cage - Juniper QFabric QFX3000-G Hardware Documentation

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Figure 26: Airflow Through the Front Card Cage and Powerhouse

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
airflow.

Figure 27: 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
Chapter 3: QFX3008-I Overview
Figure 27 on page 51 for this
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