Filler Panels also called blanking panels are used to control the air flow inside of server racks. Without the use of blanking panels the hot exhaust air from the servers can be recirculated through the server and significantly reduce the cooling efficiency of the system. Along with maximizing cooling efficiency filler panels also help with power usage effectiveness (PUE) by keeping power consumption low. Installations that have open frame racks closed server cabinets or a 2Post rack can benefit from the use of filler panels. In any data center or IT lab the filler panels also help give your rack a clean and professional look. Compatible with all EIA Standard 19" racks and cabinets with square round and threaded holes. Mounting hardware included.