A water mist system is a fire protection system which uses very fine water sprays (i.e. water mist). The small water droplets allow the water mist to control, suppress or extinguish fires by cooling, displacing oxygen and attenuating radiant heat by the small droplets themselves.
The effectiveness of a water mist system in fire suppression depends on its spray characteristics, which include the droplet size distribution, density and spray dynamics, with respect to the fire scenario, such as the shielding of the fuel, fire size and ventilation conditions.