The frame is heavy duty riveted 12-gauge steel construction and painted black. The front and rear vertical frame members accommodate Internal Mounting Rail options and provide space to route and manage customer cabling. Various cutouts are located in the top/bottom for customer cable entry; cover plates are provided as sealing and cooling options require. Rear access plates are provided standard and used for cable access and or FAN package installation; systems with optional Full Height Rear Doors do not include rear access plates and FAN packages are located on top unit cutout(s). Leveling feet which support 2000 lb. of total Foundation and user equipment weight are provided; casters are optional. A grounding lug is provided on the frame bottom but can be field relocated to the top of the frame if required. Mounting Frames or enclosure systems of the same height and depth can be mechanically clustered by attaching adjacent vertical frame members (see Cluster Kit option description).