High-pressure vs. low-pressure water mist fundamentals, how mist suppresses fire through cooling, oxygen displacement, and radiant heat blocking, NFPA 750 as a performance-based standard, and typical applications.
Water mist is defined by droplet size, not just spray pattern — atomizing water into much finer droplets than a conventional sprinkler dramatically increases the total water surface area exposed to a fire, letting mist achieve comparable or better fire control with a fraction of the water volume. This module works through low-pressure and high-pressure system fundamentals, the three mechanisms mist uses to suppress fire (cooling, oxygen displacement, and radiant heat blocking) versus a traditional sprinkler's cooling-and-wetting-only mechanism, and why NFPA 750 is written as a performance-based standard rather than a prescriptive one like NFPA 13.
By the end of this module you should be able to explain why machinery spaces and historic buildings — two very different occupancies — both reach for water mist for essentially the same underlying reason: dramatically less total water.