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Figure 21: Fan Module Used in an EX4550 Switch

g021418

You remove and replace a fan module from the rear panel of the chassis. The switch

continues to operate for a limited period of time (30 seconds) during the replacement

of the fan module without thermal shutdown.

NOTE: All three fan modules must be installed for optimal functioning of the

switch.

Two variants of fan modules are available, each with a different airflow

direction—back-to-front airflow, indicated by the label AIR IN (AFI), or front-to-back,

indicated by the label AIR OUT (AFO). Table 17 on page 36 lists the available fan module

model numbers and the direction of airflow in them.

Table 17: Fan Modules in EX4550 Switches

Direction of Airflow in the Fan ModuleLabel on the Fan ModuleModel Number

Back-to-front—air comes in from the back of the switch.AIR IN (AFI)EX4550-FAN-AFI

Front-to-back—air exhausts from the back of the switch.AIR OUT (AFO)EX4550-FAN-AFO

Airflow Direction in EX4550 Switches

Table 18 on page 36 shows the direction of airflow in EX4550 switches as shipped. All

the EX4550 switches except the EX4550-32F-S switches have the fan modules and

power supplies preinstalled on the rear panel of the switches. Power supplies and fan

modules for the EX4550-32F-S switch are not shipped by default; you must order them

separately.

Table 18: Airflow Direction in EX4550 Switches

Direction of AirflowFan Modules and 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.

The switch ships with three fan modules, each

bearing a label AIR IN (AFI), and an AC power

supply bearing a label AFI.

•

EX4550-32F-AFI

•

EX4550–32T-AFI

EX4550 Switch Hardware Guide

Juniper EX4550 Hardware Guide

Other manuals for Juniper EX4550