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QFX3000 Hardware Documentation
46
Figure 21: Location of Top Fan Tray
Top fan tray
(behind door)
ESD point
Wiring
tray 0
Power supplies 0 5
The chassis continues to operate for a limited time (2 minutes) after a fan tray has been
removed.
CAUTION:
You must replace a fan tray within 2 minutes of removing it.
The chassis has front-to-back airflow. The air intake to cool the front card cage and
power supplies is located on the front bottom of the chassis. Cool air is pulled into the
chassis and is pushed through the front card cage toward the rear fan tray. Hot air exhausts
from the upper rear of the chassis. See the side view in
airflow.
The same air intake directs cool air to the power supplies and wiring trays. The hot air
passes through the power supplies and wiring trays and exhausts on the rear of the
chassis at the bottom. See the side view in
Control Board 0
Control Board 1
Rear cards 0 7
Wiring tray 1
Grounding points (below wiring trays)
Figure 22 on page 47
Figure 22 on page 47
for this airflow.
Copyright © 2012, Juniper Networks, Inc.
for this
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