Ceiling-Type Sprinklers : A sprinkler head designed so that very little of the head projects into the room below the ceiling in which it is installed. See: Flush-Type Sprinkler
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}