Figure30: Back-to-Front Airflow Through the 24-Port and 48-Port EX4300
Switch Chassis
You must install only power supplies that have AIR IN (AFI) labels in switches in which
the fan modules have AIR IN (AFI) labels.
Do Not Mix AIR IN (AFI) and AIR OUT (AFO) Components in the Switch
Do not mix power supplies and fan modules with different airflow labels (AIR IN (AFI)
and AIR OUT (AFO)) in the same chassis. If the fan modules have AIR IN (AFI) labels, the
power supplies must also have AIR IN (AFI) labels; if the fan modules have AIR OUT (AFO)
labels, the power supplies must also have AIR OUT (AFO) labels.
The labels on the power supplies and fan modules should match the labels on the switch
chassis.
Mixing components with AIR IN (AFI) and AIR OUT (AFO) labels 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.
Positioning the Switch
In front-to-back airflow, indicated by the label AIR OUT (AFO) on the fan modules and
power supplies, hot air exhausts through the vents on the rear panel of the switch. In
back-to-front airflow, indicated by the label AIR IN (AFI) on the fan modules and power
supplies, hot air exhausts through the vents on the front panel of the switch.
47Copyright © 2017, Juniper Networks, Inc.
Chapter 3: Cooling System and Airflow
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