This standard specifies the classification, basic specifications and parameters, requirements, test methods, inspection rules and signs, packaging, transportation and storage of fan coil units (hereinafter referred to as units). This standard is applicable to the unit composed of fans and coils for external cold water supply and hot water supply, which directly supplies air to the room, and has the functions of cooling, heating or separate cooling and heating, and the air supply volume is 2500 m3/ Below h, the static pressure of the air outlet is less than 100 Pa. This standard does not apply to fan coil units with built-in cooling and heat sources and direct evaporation coils, steam coils, electric heating, etc.