A fan coil unit is the name of the device which uses a coil and a fan to heat or cool a room without connecting to duct work. These devices are systems or machines that eliminates hot air and replace it with cold and humid air by circulating cooling the air. A Fan coil unit is a device that includes fan blower and coil for heat exchange. The task of this machine is to release air into the desired space. Cooling of cold water inside the coil (supplied through the chiller) and passing air from this cooling coil cause cool air. do you know something more?