2U Rack Blank Panel 19in Server Racks The BLANKB2 2U Rack Blank Panel for 19in Server Racks and Cabinets is designed to EIA RS-310-C specifications and fits all 19 standard server racks and cabinets. Ideal for improving airflow within the rack by covering the unused spaces, the filler panel/blank panel is constructed of cold-rolled steel and features a black powder coated finish that matches most industry standard black server cabinets and racks. "