The switch supports three internal hot-swappable 12-V fan modules (FAN-T2=) are available. The air circulation system consists of the fan modules and the power supply modules. The airflow patterns vary depending on the power supply configuration.

When the fan modules are operating properly, a green LED at the top left corner of the fan assembly (viewed from the rear), is ON. If the fan fails, the LED turns to amber. The switch can operate with two operational fans, but the failed fan should be replaced as soon as possible to avoid a service interruption due to a second fan fault.

Cisco Catalyst 9300 Series Switches