Dry System : A dry-pipe automatic sprinkler system that has air instead of water under pressure in its piping; dry systems are often installed in areas subject to freezing
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}