Juniper QFX5220, Hardware Manual, Page: 54 / 247

Table 13: Fan Modules in QFX5220 Switches
Power
Supplies
Direction of Airflow
in the Fan Module
Color of
Fan
Module
Label on
the Fan
Module Airflow Diagram Fan Module
You must
install only
power supplies
that have AIR
IN labels in
switches in
which the fan
modules have
AIR 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 IN Figure16onpage57 QFX5220-32CD-FANAI
You must
install only
power supplies
that have AIR
OUT labels in
switches in
which the fan
modules have
AIR OUT
labels.
Port-to-FRU, that is,
air comes in through
vents on the end with
ports; air exhausts out
the end with the fans
(also known as
front-to-back airflow).
Juniper
gold
AIR OUT Figure17onpage57 QFX5220-32CD-FANAO
In data center deployments, position the switch in such a manner that the AIR IN labels on switch
components are next to the cold aisle, and AIR OUT labels on switch components are next to the hot
aisle.
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