Wall 2 : An upright structure of brick, concrete, wood or other similar materials serving for enclosure, division, or support, such as one of the enclosing sides of a building or room
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}