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Airow Direcon in the EX9214 Switch Chassis

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 17 on page 42.

Figure 17: Airow Through the EX9214 Switch Chassis

The host subsystem monitors the temperature of switch components. Under normal operang

condions, 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 automacally adjusted to keep the

temperature within the acceptable range. If the ambient maximum temperature specicaon is

exceeded and the system cannot be adequately cooled, the Roung 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 enre fan tray.

Juniper EX9214 Hardware Guide

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