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A fan coil unit mainly consists of a fan and a heat exchanger. Chilled (hot) water entering the room passes through the heat exchanger and exchanges cooling (heating) with the indoor air, thereby regulating the indoor air temperature and humidity. Owing to its features of high efficiency and energy saving, quiet and comfortable operation, and space saving, the unit is available in series such as horizontal concealed, horizontal exposed, vertical exposed, and cassette types. When paired with fresh-air units, it is widely used in hotels, shopping malls, offices, meeting rooms, hospitals, exhibition halls, and other locations as the terminal device of centralized air-conditioning systems.