Table 25: Airflow Direction in EX4300 Switch Models (continued)
Direction of AirflowFan Modules and Power SupplyModel Number
Back-to-front—that is, air intake to cool the
chassis is through the vents on the rear panel
of the chassis and hot air exhausts through
the vents on the front panel of the chassis.
The switch ships with two fan modules and
an AC power supply, each with a label AIR IN
(AFI).
EX4300-48T-AFI
Back-to-front—that is, air intake to cool the
chassis is through the vents on the rear panel
of the chassis and hot air exhausts through
the vents on the front panel of the chassis.
The switch ships with two fan modules and a
DC power supply, each with a label AIR IN
(AFI).
EX4300-48T-DC-AFI
CAUTION: Do not mix:
•
AC and DC power supplies in the same chassis
•
Power supplies and fan modules with different airflow labels (AIR IN (AFI)
and AIR OUT (AFO)) in the same chassis
•
Fan modules with different airflow labels (AIR IN (AFI) and AIR OUT (AFO))
in the same chassis.
•
Power supplies and fan modules with different airflow labels (AIR IN (AFI)
and AIR OUT (AFO)) in the same chassis.
Front-to-Back Airflow
In the EX4300 switch models 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 28 on page 46 and Figure 29 on page 46.
45Copyright © 2017, Juniper Networks, Inc.
Chapter 3: Cooling System and Airflow
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