Aluminium enclosure box provides a good protection for most server & Digital Video Recorder. Behind its locked door, a DVR is secured to a set of standard 19" rails. 6 rack spaces (6U) or 10.5" is available in height. Most DVR heights are 4U which means that two extra spaces are available for accessories. Six 10-32 screws are provided to fix devices to rails. The removable rear panel facilitates installation. Cable entry "knockouts" are also provided at the back of the cabinet. Two blowers 100 CFM & power bar included.