Juniper EX4550 - Figure 25: Label Identifying the Airflow Direction in an AC Power Supply; Power Supplies; Table 20: Airflow Direction in AC Power Supply for EX4550 Switches

Two variants of AC power supplies are available, each with a different airflow:
•
Back-to-front airflow, indicated by AFI label
•
Front-to-back airflow, indicated by AFO label
Each power supply has a label AFI or AFO and an arrow on the handle that depicts the
direction of airflow (see Figure 25 on page 42).
Table 20 on page 42 shows the AC power supply model numbers and the direction of
airflow in them.
Table 20: Airflow Direction in AC Power Supply for EX4550 Switches
Direction of Airflow
Label on Power
SupplyModel Number
Back-to-front—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.
AFIJPSU-650W-AC-AFI
Front-to-back—air intake to cool the chassis is through the vents on the
front panel of the chassis, and hot air exhausts through the vents on the
rear panel of the chassis.
AFOJPSU-650W-AC-AFO
Figure 25: Label Identifying the Airflow Direction in an AC Power Supply
g021437
CAUTION: Do not mix:
AC and DC power supplies in the same chassis.
•
•
Power supplies with different airflow labels (AFI and AFO) in the same
chassis.
To avoid electrical injury while installing or removing AC power supplies, carefully follow
instructions in “Installing an AC Power Supply in an EX4550 Switch” on page 203 and
“Removing an AC Power Supply from an EX4550 Switch” on page 204.
Copyright © 2015, Juniper Networks, Inc.42
EX4550 Switch Hardware Guide