Airflow Direction In The Ex9214 Switch Chassis; Figure 21: Airflow Through The Ex9214 Switch Chassis - Juniper EX9214 Hardware Manual

EX9214 Switch Hardware Guide

Airflow Direction in the EX9214 Switch Chassis

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44
The air intake to cool the chassis is located on the front of the chassis, below the lower
fan tray. Air is pulled through the chassis toward the fan tray, pushed up through the line
card slots, and through the upper fan tray. See

Figure 21: Airflow Through the EX9214 Switch Chassis

The host subsystem monitors the temperature of switch components. Under normal
operating conditions, the fans in the fan tray run at less than full speed. If a fan fails or
the ambient temperature rises above the threshold, the speed of the remaining fans is
automatically adjusted to keep the temperature within the acceptable range. If the
ambient maximum temperature specification is exceeded and the system cannot be
adequately cooled, the Routing Engine shuts down the system by disabling output power
from each power supply.
You cannot replace a single fan. If one or more fans fail, you must replace the entire fan
tray.
Field-Replaceable Units in an EX9200 Switch on page 19
Installing a Fan Tray in an EX9200 Switch on page 183
Removing a Fan Tray from an EX9200 Switch on page 186
Figure 21 on page 44.
Copyright © 2017, Juniper Networks, Inc.