CAUTION: Do not mix:
•
Fan modules with different airflow labels (AIR IN and AIR OUT) in the same chassis.
•
Power supplies with different airflow labels (AIR IN and AIR OUT) in the same chassis.
•
Fan modules and power supplies with different airflow labels (AIR IN and AIR OUT) in
the same chassis.
While replacing fan modules, you must remove only one fan module at a time from the rear panel of the
chassis. The switch continues to operate for a limited period of time (30 seconds) without thermal shutdown
while a fan module is being replaced..
NOTE: All the fan modules must be installed for optimal functioning of the switch.
The fan modules are available in two models that have different airflow directions.
•
Back-to-front (air enters through the back of the switch), indicated by label AIR IN and azure blue color
•
Front-to-back (air exhausts through the back of the switch), indicated by label AIR OUT and gold color.
QFX5120 Models and Airflow Direction
Table 12 on page 43 shows the airflow direction in QFX5120 switch models.
Table 12: Airflow Direction in QFX5120 Switch Models
Power Supplies
Direction of
Airflow in the Fan
Module
Color of the Fan
Module
Fan Modules and
Power SupplyModel Number
For switches that
have fan modules
with the AIR OUT
label, you must
install only power
supplies that have
the AIR OUT label.
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.
Juniper GoldThe switch ships
with six fan
modules and two
AC power supplies,
each with a label
AIR OUT.
QFX5120-32C-AFO
43
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