Enclosed 2 : stairway A flight of stairs surrounded by walls and fitted with fire-resistant, self-closing doors at each landing to a floor in a building
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}