Because employers wishing to hire construction Multipurpose Building, 500 people, according to the Department of public works and construction of urban. Employers must follow the format and construction, according to the Department of public works and construction of urban as well as compliance with the requirements. As well as supply or any devices that need or want to be visionary in the normal construction of complete so far used by the purpose of the employment in all respects. Me and the Board have been engaged in the study and design of air conditioning system is installed inside the building, the 500 people who have air conditioning system with air conditioning VRV has involved in versatile 500 people in the building. From a building that resembles a building with 2 floors, and a large room with a ceiling level gradient air conditioning work must therefore be effective and suitable for the number of people in the building.