AIR-HANDLING UNIT OVERVIEW

An air handling unit often abbreviated as AHU, is a factory fabricated assembly consisting of fan, heating and/or cooling coils, filters, dampers and other necessary equipment to perform one or more of the following functions of circulating, cleaning, heating, cooling, humidifying, dehumidifying, and mixing of air. 

Air handling systems range in complexity from stand-alone units that serve individual rooms to large, centrally controlled systems serving multiple areas in a building. HVAC engineers refer to the areas served by an air handling system as zones. The smaller the zone, the greater the likelihood that good control will be achieved; however, equipment and maintenance costs are directly related to the number of zones. Some systems are designed to provide individual control of rooms in a multiple-zone system. Sometimes AHUs discharge (supply) and admit (return) air directly to and from the space served, without ductwork. They can be used in many other applications, for example, they can be used for providing smoke control, maintaining pressure relationships between spaces, and providing fresh air for occupants. 

All standard air handlers are designed to move a certain amount of air typically 400 cubic feet per minute (CFM) for 1 ton of refrigeration. Air handling systems utilize various types of equipment, arranged in a specific order, so that space conditions can be maintained. Within each basic component there are different types and styles, each with their own operating characteristics and efficiency, method and materials of construction, and cost, all of which greatly affect the initial design and resulting operating economics of the system.  

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