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Internet Data Center (IDC) heat removal is one of the most essential yet least understood of all critical IT environment processes. The cooling of data centers has emerged as a significant challenge as the density of computing equipment increases. All cooling systems use a Computer Room Air Conditioning (CRAC) and or a Computer Room Air Handling (CRAH) unit of some kind, which come in various capacities and remove the heat energy from the room. However, the primary distinctions that affect the capability of cooling systems are rooted in the distribution system. There are five heat removal methods and two common physical equipment arrangements that can be combined to create ten basic types of cooling systems. Air supply and air return systems each have three and four different configurations which can be combined to create thirteen basic types. An understanding of the many types of cooling/air distribution systems and their attributes can be used to develop guidelines for when each type should be used, and such guidelines are provided in this study for both raised floor and hard floor applications. In this research, cooling and air distribution system aspects of design criteria were analyzed by quantitative data, acquired by surveyed 36 domestic and overseas multi-megawatt data centers. And this paper provides the best configurations and design criteria for different IT environments and common practices and equipment options that may increase cooling system availability. The information presented here is a foundation allowing IT professionals to successfully manage the specification, installation, and operation of IT environment cooling systems.