StarTech.com 4U Blank Panel for 19 inch Rack - Rack Mount Blanking Panel for Server/Network Racks, Enclosures & Cabinets - 4RU Rack Filler Panel/Spacer/Plates - Solid Panel - Steel (RKPNL4U)This 4U blanking panel helps improve the appearance and airflow of your EIA 310 compliant 19 in. server rack. This solid blank rack panel creates a clean and professional look by covering empty rack spaces and visible cables, for a more organized server room. When 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