Do Not Mix Air In (Afi) And Air Out (Afo) Components In The Switch; Positioning The Switch; Figure 30: Back-To-Front Airflow Through The 24-Port And 48-Port Ex4300 - Juniper EX4300 Hardware Manual

Do Not Mix AIR IN (AFI) and AIR OUT (AFO) Components in the Switch

Positioning the Switch

Copyright © 2017, Juniper Networks, Inc.

Figure 30: Back-to-Front Airflow Through the 24-Port and 48-Port EX4300

Switch Chassis
You must install only power supplies that have
the fan modules have
AIR IN (AFI)
Do not mix power supplies and fan modules with different airflow labels (
and ) in the same chassis. If the fan modules have
AIR OUT (AFO)
power supplies must also have
labels, the power supplies must also have
The labels on the power supplies and fan modules should match the labels on the switch
chassis.
Mixing components with
AIR IN (AFI)
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
power supplies, hot air exhausts through the vents on the rear panel of the switch. In
back-to-front airflow, indicated by the label
supplies, hot air exhausts through the vents on the front panel of the switch.
Chapter 3: Cooling System and Airflow
AIR IN (AFI)
labels.
AIR IN (AFI) labels; if the fan modules have
AIR OUT (AFO)
and
AIR OUT (AFO)
AIR OUT (AFO)
AIR IN (AFI) on the fan modules and power
labels in switches in which
AIR IN (AFI)
labels, the
AIR IN (AFI)
AIR OUT (AFO)
labels.
labels in the same chassis
on the fan modules and
47