This NEW all aluminum enclosure box provides a good protection for most server and Digital Video Recorder. Behind its locked door, a DVR/NVR is secured to a set of standard 19" rails. 6 rack spaces (6U) or 10.5" is available in height. Most DVR/NVR 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. Available with 4" 100 CFM fan & power bar (FREDVR6U).