In the ever changing data center, there will come a time when you may have to remove a rack for maintenance, or perhaps you provide rack and stack testing and have a very dynamic floor with racks moving often. Here is an easy lower cost solution to close those empty gap spaces. Expandable Filler Panels (EFP) are designed to fill space between racks, power units, columns or other gaps in your data center where air can escape, reducing the effectiveness of your cooling efforts. These panels install quickly as permanent or temporary fillers for missing or removed racks.