All aluminum CPU Lock Box, lightweight, has a hinged front door and a sliding tray that pulls out 28'' to provide rear access for easy installation and service. The vented door and side panels mean that, and in most cases a blower is not required. Two flat key cam locks are used to secure the front door. Wiring cable entry is provided on the rear panel. The FRE142229 include a 4" 110 CFM fan & power bar.