The definition of air handling unit from ANSI/AHRI Conventional 430-2009 states that it's “A manufacturing facility-produced encased assembly consisting of the fan or lovers and also other required tools to conduct one or more of the capabilities of circulating, cleansing, heating, cooling, humidifying, dehumidifying and mixing of air….” Modular AHUs https://waterchillers28269.bloggazzo.com/31438174/fascination-about-ahu-s