1. which are the rooms can be use for Aerosol system as per NFPA ?
Aerosol systems are not referenced by any building code, or even the NFPA standard for Information Technology (NFPA 75). You probably won't find any NFPA literature supporting their use for any particular applications.
Some people would say that aerosol systems are suitable for electrical plant rooms, despite the statistical evidence that sprinklers, or 2 hour fire rated walls are fine for electrical plant rooms.
The 2018 edition of NFPA 1, Fire Code permits the other required fire protection systems including aerosol extinguishing systems. I did not search the code for the specific locations of application.
To me, aerosol systems may be suitable for special hazards applications as an alternative for Halon 1301 systems and high-pressure carbon dioxide systems. Aerosol systems may also be used as alternatives to clean agent gaseous suppressants or water-mist systems.
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