Cooling System And Airflow; Cooling System And Airflow In An Ex4500 Switch; Fan Tray; Figure 18: Fan Tray Used In An Ex4500 Switch - Juniper EX4500 Hardware Manual

CHAPTER 3

Cooling System and Airflow

Cooling System and Airflow in an EX4500 Switch

Fan Tray

Copyright © 2017, Juniper Networks, Inc.
Cooling System and Airflow in an EX4500 Switch on page 35
The cooling system in an EX4500 switch consists of a single fan tray.
This topic describes:
Fan Tray on page 35
Airfow Direction in EX4500 Switch Models on page 36
Front-to-Back Airflow on page 36
Back-to-Front Airflow on page 37
The fan tray is a hot-insertable and hot-removable field-replaceable unit (FRU). The fan
tray contains five fans (see

Figure 18: Fan Tray Used in an EX4500 Switch

Fan tray handles
The fan tray installs horizontally in the rear of the chassis. The fan tray has two handles,
one on each side that facilitate handling of the fan tray.
You remove and replace the fan tray from the rear of the chassis. The switch continues
to operate for a limited time (30 seconds) during the replacement of the fan tray without
thermal shutdown.
The fan tray provides front-to-back or back-to-front airflow depending on the switch
model you purchase.
Figure 18 on page 35).
35