Vault 02 : A fire-resistive enclosure used exclusively for storage that is equipped, maintained, and supervised to minimize the possibility of fire destroying the contents
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}