Water mist is a fire suppression technology that discharges water as very fine droplets instead of a conventional spray. It is used where water damage, available space or difficult evacuation are decisive in choosing a system.
How does water mist put out a fire?
The fine droplets work through three mechanisms together:
- Heat absorption: the droplets evaporate quickly and draw heat from the flame and hot surfaces.
- Local oxygen displacement: as water turns to steam around the flame, less oxygen is available to it.
- Radiant heat blocking: the mist limits heat transfer to nearby surfaces, reducing fire spread.
Types of water mist systems
- Open or closed nozzles: chosen by hazard and activation method.
- Wet, pre-action or deluge: the designer selects the type that fits the space.
Benefits (depending on design)
- Much less water than conventional sprinklers.
- Does not rely on chemical agents to suppress the fire.
- Smaller pipes, tanks and pumps in some applications.
- Cooling that helps limit re-ignition.
- Helps reduce smoke by capturing particles.
Limits of water mist
- It is not right for every hazard or every space.
- The system must be designed and tested for the specific hazard under the applicable code, such as NFPA 750 for water mist systems.
- Fine nozzles need clean water, good filtration and regular maintenance.
Where is it used?
Depending on the hazard study, it is used in tunnels, theatres and opera houses, heritage buildings and museums, and some machinery spaces and industrial areas.
Frequently asked questions
Is water mist a replacement for every suppression system?
No. Each system has suitable applications, and the technical office decides the best fit for the hazard and the space.
Does it suit server rooms?
It can be considered for some server rooms, depending on the design, and each project is reviewed against its own requirements.
Learn about ATC’s water mist service or request a consultation · 📞 +966 54 653 0462 | +966 56 980 6779