NFPA750 High Pressure Water Mist Fire System Pump Pressurized Type

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 both the flame and surrounding gases by evaporation---Absorb Heat&Cooling Displacing oxygen by evaporation---Isolate Oxygen Attenuating radiant heat by the small droplets themselves---Isolate Heat

The effectiveness of a water mist system in fire suppression depends on its spray characteristics, which include the droplet size distribution, spray density and spray dynamics, with respect to the fire scenario, such as the shielding of the fuel, fire size and ventilation conditions.

So really high pressure system, specialized tubing or piping that's used for that. Now, there are differences between water mist systems and the droplet sizes that they produce, so typically the smaller the water droplet size the better it is at extinguishing a hot fire. Larger droplets can work faster on lower temperature fires, but they all work for the systems that they're approved for or listed for.