HP Integrity rx7620 Site Preparation Guide, Fourth Editon - HP Integrity rx762 - Page 51

General Site Preparation Guidelines Environmental Elements Environmental Elements The following environmental elements can affect server installation: • Computer room preparation • Cooling requirements • Humidity level • Air conditioning ducts • Dust and pollution control • Metallic particle contamination • Electrostatic discharge (ESD) prevention • Acoustics (noise reduction) Computer Room Preparation The following guidelines are recommended when preparing a computer room for the server: • Locate the computer room away from the exterior walls of the building to avoid the heat gain from windows and exterior wall surfaces. • When exterior windows are unavoidable, use windows that are double- or triple-glazed and shaded to prevent direct sunlight from entering the computer room. • Maintain the computer room at a positive pressure relative to surrounding spaces. • Use a vapor barrier installed around the entire computer room envelope to restrain moisture migration. • Caulk and vapor seal all pipes and cables that penetrate the envelope. • Use at least a 12-inch raised floor system for the most favorable room air distribution system (underfloor distribution). • Ensure a minimum ceiling height of 12 inches between the top of the server and the ceiling and that all ceiling clips are in place. • Allow 18 inches (or local code minimum clearance) from the top of the server cabinet to the fire sprinkler heads. Cooling Requirements Air conditioning equipment requirements and recommendations are described in the following sections. Basic Air Conditioning Equipment Requirements The cooling capacity of the installed air conditioning equipment for the computer room should be sufficient to offset the computer equipment dissipation loads, as well as any space envelope heat gain. This equipment should include: • Air filtration • Cooling or dehumidification • Humidification Appendix B 37