The definition of air handling unit from ANSI/AHRI Conventional 430-2009 states that it's “A manufacturing unit-built encased assembly consisting of the fan or followers as well as other necessary gear to carry out one or more in the capabilities of circulating, cleansing, heating, cooling, humidifying, dehumidifying and mixing of air….” https://ahu-hire15926.gynoblog.com/33552080/the-best-side-of-ahu-s