"Improve the organization and appearance of your rack in seconds, with a tool-less solid blanking panelThis 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.The StarTech.com Advantage- COMPATIBLE WITH 19"" WIDE RACKS: This 4U blank panel is designed to EIA-310 specifications and fits all 19"" standard network/server racks and cabinets; ships with hardware to mount this metal panel to your rack, installation is quick and easy- PROTECT YOUR EQUIPMENT: This solid blanking panel/spacer helps to protect valuable rackmount server equipment by creating space between installed devices, promoting airflow and passive cooling- TECHNICAL SPECIFICATIONS: Width: 19 inches"