Figure 9: QFX5110 Fan Module
You remove and replace a fan module from the FRU end 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 fan modules must be installed for optimal operation of the switch.
The fan modules are available in two product SKUs that have different airflow directions,
airflow in and airflow out. Airflow in is indicated on the module by the azure blue color
and a label marked AIR IN. Airflow in this version of the fan module bring air into the fans
and power supplies and exhaust air through the ports. Likewise, airflow out is indicated
by a gold color and a label marked AIR OUT. Airflow out versions of the fan module brings
air into the switch through the vents around the ports and exhaust air through the fans
and power supplies. Table 12 on page 26 lists the available fan module product SKUs
and the direction of airflow in them.
Table 12: Fan Modules in the QFX5110
Power Supplies
Direction of Airflow in
the Fan Module
Color of Fan
Module
Label on the
Fan ModuleAirflow DiagramFan Module
You must install
only power
supplies that
have AIR IN labels
in switches in
which the fan
modules haveAIR
IN labels.
FRU-to-port, that is, air
comes in from the end of
the switch with the fans;
air exhausts from the
switch end with ports
(also known as
back-to-front airflow).
Juniper Azure
Blue
AIR INFigure10 on page27QFX5110-48S-FANAFI
You must install
only power
supplies that
have AIR OUT
labels in switches
in which the fan
modules haveAIR
OUT labels.
Port-to-FRU, that is, air
comes in through vents
on the end with ports; air
exhaustsout the end with
the fans (also known as
front-to-back airflow).
Juniper GoldAIR OUTFigure 11 on page28QFX5110-48S-FANAFO
Copyright © 2017, Juniper Networks, Inc.26
QFX5110 Switch Hardware Guide
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