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Water mist systems are widely used for fire protection in substituting gas protection Halon system. Very few articles appeared in the literature on the design and operation principles of the nozzles though there must be some restricted reports for commercial products. A brief review on the water mist nozzle reported in the literature will be presented in this paper. It is observed that three common types of nozzle are widely applied: impinging type, pressure-jet type and twin-fluid air-atomizing type. These products have their own characteristics and application areas. To improve reliability and performance of the system, more efforts should be paid on developing nozzles for discharging less water but extinguishing a fire faster.