This large equipment box has 17.88 x 13.71 x 5.35 in. of storage and comes with integrated rack mount rails 3RU high. The GB-MBX300 was designed to hold freestanding or rack-mountable small form factor PCs and other digital media components. The integrated cable bushing allows power and cable to feed directly into the secured box. This box is also designed for use with optional fans (CUS-FAN) that can be installed to increase airflow. All equipment GearBoxes™ are available with a variety of mounting options. They can be mounted directly to Premier Mounts' ECM ceiling mounts, or carts & stands using dual- or single-pole adapters.