An air handling system is a type of mechanical system that is used to condition and circulate air as part of a heating, ventilation, and air conditioning (HVAC) system. It is responsible for the movement of air through a building or space, as well as the filtration, heating, cooling, and humidification of the air. Air handling systems are made up of several components, including fans, dampers, filters, coils, and ducts. Fans are used to move air through the system, while dampers control the flow of air. Filters are used to remove dust, pollen, and other contaminants from the air, while coils are used to heat or cool the air. Finally, ducts are used to transport the air throughout the building or space. Air handling systems are essential for providing a comfortable and healthy environment in any building or space.