Water Spray System, Ultra High-Speed : A type of automatic water spray system where water spray is rapidly applied to protect specific hazards where deflagrations are anticipated
NFPA 15 Standard for Water Spray Fixed Systems For Fire Protection, 2001 ed. https://law.resource.org/pub/us/cfr/ibr/004/nfpa.2 5.2002.pdf, (Std: Wtr Spray Fixed Sys for Fr Prac - Amer) {183 NFC}