This 4U blanking panel helps improve the appearance and airflow of your EIA-310 compliant 19 in. server rack.Professional LookThis solid blank rack panel creates a clean and professional look by covering empty rack spaces and visible cables, for a more organized server room.Improve AirflowWhen used to cover unused rack units, this 4RU panel can help to control airflow and in certain applications, control internal temperatures by reducing the recirculation of hot air within the rack, created when unused spaces are left uncovered.RKPNL4U is backed by a 2-year StarTech.com warranty and free lifetime technical support.