The external static pressure of the fan coil unit can be divided into standard type and high static pressure type, and can be divided into two rows and three rows according to the number of heat exchange coils. Fan coil unit is referred to as fan coil unit. It is one of the end devices of the air-conditioning system and consists of small fans, motors and coils (air heat exchangers).

It is controlled by an electrical switch, and the cooling (heating) amount of the fan coil is adjusted accordingly. The fan is the power source for conveying air, and it is also the source of disturbance to strengthen the convective heat transfer on the air side (outer surface of the coil). Together with the motor, it is the main noise source of the unit. Coil: is an air-water heat exchanger made of finned tubes. Refrigerant water (hot water) flows in the tubes. Since the temperature of the refrigerant water is lower than the dew point temperature of the air, there is condensed water on the outer surface of the tube, which is a heat exchange in a humid state, which has both heat exchange and mass exchange, which improves the heat exchange effect. The coils bear most or all of the indoor air conditioning load, with 3-4 rows of pipes. Condensation pan: It is placed under the coil with the drain pipe, and its function is to receive the water droplets that are continuously condensed on the coil and discharge it to the outside through the drain pipe. Air filter: Placed under the coil with drain pipe, its function is to receive the water droplets that are constantly condensing on the coil, and discharge it outdoors through the drain pipe. The fan coil unit can be divided into water circuit and air circuit.