Site Preparation | 133Site PreparationThis chapter describes the requirements for the room, rack, and cabinet in which you will install yoursystem.• Site Selection• Equipment Rack and Cabinet Requirements• Power Requirements• Storage RequirementsSite SelectionBefore you begin, make sure that the area where you intend to install your system meets the followingrequirements:1 The site is in a restricted access area.2 The site is a dry, clean, well-ventilated, and temperature-controlled room, away from heat sourcessuch as hot air vents or direct sunlight.3 The site is away from sources of severe electromagnetic noise.4 The site is near an adequate power source. Connect the system to the appropriate branch circuitprotection as defined by local electrical codes.Equipment Rack and Cabinet Requirements1 Ensure that the rack has adequate space in the front, rear, and sides after the system is installed toallow proper ventilation, access to cables, and maintenance access. Allow at least 18 inches in thefront and 20 inches in the rear of the rack.2 Ensure that the rack is bolted to the floor and/or braced to a wall or ceiling.3 The minimum cabinet size is 30 inches deep and 24 inches wide.4 Provide a minimum of 20 inches clearance behind the chassis to access the fan trays.5 Air flows through the system from a filtered intake vent on the bottom front side of the chassis to anexhaust vent at the top rear. For proper ventilation, position the chassis in an equipment rack orcabinet so that the minimum air flow is 750 cubic feet per minute (CFM), this requires a minimum of3 inches between the doors and the cable management system when the cabinet front doors areclosed, and a minimum of 3 inches between the chassis rear and the rear of the cabinet.