Six fan bays located in the rear of the switch accommodate hot-swappable fan modules that cool the switch. The fan modules are available with front-to-back or back-to-front airflow. The direction of the airflow of all six fans must be the same. Power supplies have integrated cooling fans that operate independently of the switch fans. The direction of the airflow in the fans and power supplies must be the same.
Fans are ordered separately for base models 8520-48Y-8C and 8520-48XT-6C. Fans are included with other models.