Water Spray Nozzle, Open : An open water discharge device that, when discharging water under pressure, will distribute the water in a specific, directional pattern
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}