What is defined as a water mist system?

• A. A distribution system connected to a water supply or water and atomizing media supplies that is equipped with one or more nozzles capable of delivering water mist intended to control, suppress, or extinguish fires
• B. A conventional sprinkler system delivering large droplets
• C. A foam suppression system
• D. A dry chemical fire suppression device

Answer: (D)

Water mist systems rely on delivering fine water droplets through nozzles that are able to absorb heat quickly and control, suppress, or extinguish fires. They are supplied by a water source or water with atomizing media, and the key feature is the atomized mist rather than large droplets. This distinguishes them from conventional sprinkler systems that release larger droplets, foam suppression systems that mix foam concentrates with water, and dry chemical fire suppression devices that use powder instead of water. The defining idea is using atomized water to achieve effective fire control with often less overall water damage.