Improve the cooling flow and appearance of your racks and cabinets by filling the gaps between equipment. The BLANKB1 1U 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.