Halon Systems, NFPA 12A; these systems were banned with the Montreal Protocol while in the late nineteen eighties—any system can be a legacy system installed prior to this ban
A fire suppression system works by https://patch.com/north-carolina/raleigh/classifieds/gigs-services/467764/safeguarding-lives-and-property-all-american-fire-protections-quarter-century-of-excellence