Juniper QFabric QFX3000-G Hardware Documentation page 211

Do Not Mix AIR IN (AFI) and AIR OUT (AFO) Components in the Switch
Positioning the Switch
Fan Module Status
Copyright © 2018, Juniper Networks, Inc.
You must install only power supplies that have
the fan modules have
AIR IN (AFI)
Do not mix power supplies and fan modules with different airflow labels (
and AIR OUT (AFO) ) in the same chassis. If the fan modules have
power supplies must also have
labels, the power supplies must also have
The labels on the power supplies and fan modules should match the labels on the switch
chassis.
Mixing components with
AIR IN (AFI)
hampers the performance of the cooling system of the switch and leads to overheating
of the chassis.
CAUTION: The system raises an alarm if a fan module fails or if the ambient
temperature inside the chassis rises above the acceptable range. If the
temperature inside the chassis rises above the threshold temperature, the
system shuts down automatically.
In front-to-back airflow, indicated by the label
power supplies, hot air exhausts through the vents on the rear panel of the switch. In
back-to-front airflow, indicated by the label
supplies, hot air exhausts through the vents on the front panel of the switch.
In data center deployments, position the switch in such a manner that the
labels on switch components are next to the cold aisle, and
switch components are next to the hot aisle.
Each switch has a status LED for each fan module next to the fan module slot on the
rear panel of the chassis. The Status LED indicates the status of the fan module.
Table 14 on page 93 describes the Status LED on the fan module in an EX4300 switch.
AIR IN (AFI)
labels.
labels; if the fan modules have
AIR IN (AFI)
AIR OUT (AFO)
and
AIR OUT (AFO)
AIR OUT (AFO)
on the fan modules and power
AIR IN (AFI)
Chapter 7: EX4300 Overview
labels in switches in which
AIR IN (AFI)
AIR IN (AFI) labels, the
AIR OUT (AFO)
labels.
labels in the same chassis
on the fan modules and
AIR IN (AFI)
labels on
AIR OUT (AFO)
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