Carbon Dioxide Systems, NFPA 12; these systems are Employed in overall flooding purposes in spaces that aren't habitable, as carbon dioxide is hazardous
Their layout is intentional; only the sprinkler heads subjected https://patch.com/north-carolina/raleigh/classifieds/gigs-services/467764/safeguarding-lives-and-property-all-american-fire-protections-quarter-century-of-excellence