Curtain Board 2 : A sheet metal or other noncombustible curtain that extends from the ceiling downwards at the edge of a hazardous area for the purpose of containing hot gasses and smoke so it can be vented. See: Draft Curtain
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}