SRX4120 Cooling System

The SRX4120 cooling system includes fan modules and status indicator LEDs.

You can install four fan modules (SRX-FAN-1RU-AFO) in the SRX4120 for 3+1 redundancy.

The fan modules in the SRX4120 are hot-insertable and hot-removable field-replaceable units (FRUs). You can install the fan modules in the fan module slots on the rear of the device.

Airflow

The SRX4120 has a front-to-back (AIR OUT) cooling system. Air is pulled through the front of the chassis toward the fans, which exhaust the air out of the device.

Figure 1: Airflow Through the Chassis Diagram of airflow in a server chassis with green arrows showing air entering from ports and exiting at FRUs for cooling.

Diagram of airflow in a server chassis with green arrows showing air entering from ports and exiting at FRUs for cooling.

Power Supply Cooling System

The power supply units (PSUs) are self-cooling and are located at the rear of the SRX4120. There are multiple airflow ducts on the front of the chassis that provide fresh air to the PSUs to maintain the thermal requirements.

Technical line drawing of an air filter component labeled AIR OUT AFO with honeycomb pattern and vent structure.

SRX-FAN-1RU-AFO Specifications

Table 1: Physical Specifications
Specification	Value
Height	1.61 in. (4.1 cm)
Width	1.61 in. (4.1 cm)
Depth	4.41 in. (11.2 cm)
Weight	0.16 lb (0.074 kg)
Airflow	AFO

Table 2: Power Specifications
Specification	Value
Maximum power requirement	17.28 W
Typical power requirement	14.4 W

SRX-FAN-1RU-AFO LEDs

Figure 2: SRX-FAN-1RU-AFO LEDs Technical drawing of a modular cooling system with hexagonal patterns and fan icons labeled 0 to 3 for airflow management.

Technical drawing of a modular cooling system with hexagonal patterns and fan icons labeled 0 to 3 for airflow management.

Table 3: SRX-FAN-1RU-AFO LEDs
Callout	State	Description
1	Solid green	The fan module is operating normally. The system has verified that the module is engaged, that the airflow is in the correct direction, and that the fan is operating correctly.
1	Solid red	The system has detected an error in the fan module. Replace the module immediately. Either the fan has failed, or it is seated incorrectly. To maintain proper airflow through the chassis, leave the fan module installed in the chassis until you are ready to replace it.