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Download this guide: Complete Hardware Guide for EX3300 Ethernet Switches

Cooling System and Airflow in an EX3300 Switch

The cooling system in an EX3300 switch consists of two fans: one along the rear of the chassis and another along the left side of the chassis. The fans provide front-to-back or back-to-front chassis cooling depending on the switch model.

This topic describes:

Airflow Direction in EX3300 Switch Models

Table 14 shows the different EX3300 switch models and their direction of airflow.

Table 14: Airflow Direction in EX3300 Switch Models

Model	Direction of Airflow
EX3300-24T	Front-to-back
EX3300-24P	Front-to-back
EX3300-24T-DC	Front-to-back
EX3300-48T	Front-to-back
EX3300-48T-BF	Back-to-front
EX3300-48P	Front-to-back

Front-to-Back Airflow

In front-to-back airflow models, the air intake is located on the front of the chassis. Cool air is pulled into the chassis and pushed toward the rear of the chassis. Hot air exhausts from the rear of the chassis. See Figure 10.

Figure 10: Front-to-Back Airflow Through the EX3300 Switch Chassis

Back-to-Front Airflow

In back-to-front airflow models, the air intake is located on the rear of the chassis. Cool air is pulled into the chassis and pushed toward the front of the chassis. Hot air exhausts from the front of the chassis. See Figure 11.

Figure 11: Back-to-Front Airflow Through the EX3300 Switch Chassis

Under normal operating conditions, the fans operate at moderate speeds for minimal noise. Temperature sensors in the chassis monitor the temperature within the chassis. If any fan fails or if the temperature inside the chassis rises above the threshold, the switch raises an alarm and all functioning fans operate at a higher speed than normal. If the temperature inside the chassis rises above the threshold, the switch shuts down automatically.