An air handling unit, also called AHU, is a device used to regulate and circulate air as part of a heating, ventilating, and air conditioning (HVAC) system. It comprises an assemblage of parts installed in a large, comprehensible box shaped units called modules, usually a big metal box with a blower, heating or cooling elements, filter racks, sound attenuators, and dampers inside them for appropriate ventilation requirements for purifying, air-conditioning, or renewing the indoor air in a building or premises. Such constructions reduce heat loss. They are installed on buildings and the air is circulated through ducts.
In addition to controlling proper ventilation, the AHU performs other functions like filtration and control of the quality of the air that will reach the interior. This function is dependent on the filters installed in the AHU is called the air purification filters, and in turn depend on the retention filters is the clarity of the air. These also control the temperature of air that is regulated in an HVAC system. Thus giving the conditioning and cooling effect. The third important function is to control relative humidity monitoring for greater indoor comfort.
AHU is mostly installed in places where a large number of people come and go or accumulate and natural ventilation is limited: hotels and their dining rooms, functions and party rooms, indoor events, restaurants, convention halls. It is also suitable for spaces with extreme hygiene requirements: laboratories, clean rooms, or operating theatres, among others.