The OAT300S features a shortened (14″) rail and is expandable to 6 fans. Fan trays provide your equipment racks and enclosures with high volume airflow to keep your equipment cool. These fan trays can be assembled using AC, EC, or DC fans with options for vertical or horizontal airflow. All fan trays are between 1 RU and 3 RU and are designed to fit any 19” rack application. Temperature-controlled fans are available as an optional add-on for EC and DC fan trays. Standard fan trays are available in universal range, low-noise, and high-speed models. Optional monitoring and alarm systems are available for applications with limited access. The ST on the end of the part number denotes a model that cannot be modified from its current form.