Sturdy bracing on lower portion of frame increases rack stability and balance. Meets California Building Code requirements. Integral front waterfall top. Easily joins with other 4-post or 2-post racks to meet all your equipment mounting needs. EIA standard to fit 19" rack equipment and accessories. Grounding kit included. Dynamic load rating of 1000 pounds (454 kg) for earthquake zones; static load rating of 2500 pounds (1134 kg) for non-earthquake zones. The Zone 4 4-Post Seismic Rack gives you the mounting security of a cabinet with the convenience of an open rack. An adjustable depth and solid base make this rack well suited for heavy, deep networking equipment, telephone and voice mail equipment, routers, servers, and switches. This rack easily exceeds the load capacity of a 2-post rack. With standard rails, 19" rack accessories and equipment mount easily in this open frame rack. Additionally, it can be bayed with other 2- and 4-post racks to encompass your server and equipment storage needs.