Air Handling Units are the lungs of any HVAC system. It's a device especially employed for controlling and circulating air for part of heating, venting and air-conditioning systems. Air handling units are located in moderate to large industrial and commercial buildings. Ordinarily, these systems are situated in the basement, roof or around the ground of this building. The air handling units are functioned as particular places or zones in a structure such as the east side, flooring, construction bathrooms, etc.. A couple of buildings, particularly old high rise buildings, have just a sizable AHU located on the roof. These can provide the comprehensive building where they may not be needing a return home.