Selecting the right rack requires evaluating its height (U), depth, width, weight capacity, airflow design, power integration (PDU/UPS/ATS), cable management strategy, and environmental monitoring options. The Cisco® Enterprise Data Center Architecture—a comprehensive, adaptive network architecture designed by Cisco Systems® for agile Information Technology (IT) support of business needs—critically depends upon underlying physical facilities to provide the power, cooling, physical housing, cabling. Most systems and storage products are designed to pull chilled air through the front of the system and exhaust hot air out of the back. The most important requirement is to ensure that the inlet air temperature to the front of the equipment does not exceed IBM® environmental specifications. See the. There are three primary rack types - open-frame racks, enclosed cabinets, and wall-mount racks, each suited for different levels of security, cooling, and equipment density. The. See the environmental requirements in the server specifications or hardware specification sheets. When upgrading or repairing your server, be sure not to exceed, if specified, the maximum allowed. This guide provides an overview of best practices for energy-efficient data center design which spans the categories of information technology (IT) systems and their environmental conditions, data center air management, cooling and electrical systems, and heat recovery.