Front-To-Back Airflow; Do Not Install Components With Different Airflow In The Switch; Positioning The Switch; Figure 23: Front-To-Back Airflow Through The Ex4550 Switch Chassis - Juniper EX4550 Hardware Manual

EX4550 Switch Hardware Guide

Front-to-Back Airflow

Do Not Install Components with Different Airflow in the Switch

Positioning the Switch

38
You must install only power supplies that have
modules have
AIR IN (AFI)
In the EX4550 switches that have front-to-back airflow, the air intake to cool the chassis
is through the vents on the front panel of the switch, and hot air exhausts through the
vents on the rear panel. See

Figure 23: Front-to-Back Airflow Through the EX4550 Switch Chassis

Front
You must install only power supplies that have
modules have
AIR OUT (AFO)
Do not mix power supplies with different airflow labels (
with different airflow labels (
fan modules have AIR IN (AFI)
modules have
AIR OUT (AFO)
Mixing components with different airflows in the same chassis hampers the performance
of the cooling system of the switch and leads to overheating of the chassis.
CAUTION: The system raises an alarm if a fan module fails or if the ambient
temperature inside the chassis rises above the acceptable range. If the
temperature inside the chassis rises above the threshold temperature, the
system shuts down automatically.
In front-to-back airflow, indicated by the label
the label on the power supplies, hot air exhausts through the vents on the rear panel
AFO
labels in switches in which the fan
AFI
labels.
Figure 23 on page 38.
AFO labels in switches in which the fan
labels.
and
AIR IN (AFI) AIR OUT (AFO)
labels, the power supplies must have
labels, the power supplies must have
AIR OUT (AFO)
Rear
and ) and fan modules
AFI AFO
) in the same chassis. If the
AFI labels; if the fan
labels.
AFO
on the fan modules and
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