This unit is ideal for extreme venting of cabinets and enclosures. It features two large, top-quality brushless fans for higher airflow, low noise and long life. The fan unit can be configured to pull air out of a cabinet (the default & recommended configuration) or push air into the cabinet depending on the application. The fans are mounted using a special vibration dampening system which eliminates noise caused by fan vibration and also facilitates easily changing the direction of the airflow. The unit is powered with DC voltage and when used with our Universal Power Supplies, can be run silently or more aggressively depending on the application.