In Data Center, the temperature control is very important. In order to control and cool down mainframes and all the racks of servers, Computer Room Air Conditioning (CRAC) is a devices used to monitor and maintain the temperature, air distribution and humidity in a data center. The CRAC unit can be situated in various ways for cooling purposes. One of the most successful ways of cooling is to have the cool air dispensed through the raised floor system, flowing through the racks and dispensed the hot air behind the racks and back to CRAC air intake.