The definition of air handling unit from ANSI/AHRI Normal 430-2009 states that it is “A factory-created encased assembly consisting of the fan or admirers and also other necessary equipment to conduct one or more with the functions of circulating, cleaning, heating, cooling, humidifying, dehumidifying and mixing of air….” The ACR https://shanevadgj.amoblog.com/helping-the-others-realize-the-advantages-of-ahu-s-54335757