Air that meets the requirements speci fied in CGA G-7. 1, Commodity Specification for Air, for Grade D and E air for human respiration and NFPA 1500, Standard on Fire Department Occupational Safety and Health Program. NFPA 1989, 2003 ed
National Fire Protection Association, Illustrated Dictionary of Fire Service Terms, Jones & Bartlett Publishers, MA. USA 2006. https://books.google.com.kw/books?id=W0WIRa3Gl4QC& printsec=frontcover&source=gbs_ge_summary_r&cad=0# v=onepage&q&f=false, (Fr Srvc - Amer) {141}