Halon Systems, NFPA 12A; these systems have been banned from the Montreal Protocol in the late nineteen eighties—any system can be a legacy system put in before this ban
That means homeowners who put in a fire https://patch.com/north-carolina/raleigh/classifieds/gigs-services/467764/safeguarding-lives-and-property-all-american-fire-protections-quarter-century-of-excellence