Unit of Exit Width 2 : The width necessary (22 in. for the orderly movement of a single line of people along a passageway or through an exit during an emergency
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}