Cooling System And Airflow In An Ex4100 And Ex4100-F Switch - Juniper EX4100 Hardware Manual

Cooling System and Airflow in an EX4100 and
EX4100-F Switch
IN THIS SECTION
Fan Modules | 53
Airflow Direction in EX4100 and EX4100-F Switch Models | 55
EX4100 and EX4100-F Switches with Front-to-Back Airflow | 57
EX4100 Switches with Back-to-Front Airflow | 64
How to Position the Switch | 66
Fan Module Status | 67
The cooling system in an EX4100 and EX4100-F switch consists of field-replaceable fan modules and
built-in fan(s). The airflow direction depends on the fan modules and power supplies installed in the
switch. You can order an EX4100 switch that supports front-to-back airflow (air enters through the front
of the switch) or back-to-front airflow (air enters through the back of the switch) or an EX4100-F switch
that has built-in fan(s).
Fan Modules
The fan modules are hot-removable and hot-insertable field-replaceable units (FRUs) installed in the rear
panel of the EX4100 switch. You can remove and replace them without powering off the switch or
disrupting switch functions.
EX4100 switches ship with two fan modules (1+1 redundancy) installed in the rear panel of the switch.
The fan module slots display numbers 0 and 1 and each slot has a fan icon next to it.
The fan modules are available in two models that have different airflow directions:
• Front-to-back, indicated by the label AIR OUT and Juniper Gold handle. The front-to-back airflow
direction means that cold air enters through the front of the switch, and hot air exits through the
back of the switch.
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