Lone Star Racks 1U Fan Tray is equipped with 4-120mm fans to assist with air flow circulation within your rack enclosures and server cabinets. Air flow circulation is integral to keeping your servers and equipment running at a safe operating temperature. This fan tray takes up only 1U of rack space and is compatible with any 19" rack or cabinet. Due to its shallow depth, two trays can be mounted back to back to increase airflow. The fan tray's readily accessible power switch makes it easy to control the air flow within the enclosure. Lone Star Racks 1U Fan Tray is a great solution for any rack cooling needs.