The changing of air within a compartment by natural or mechanical means, (see Figure v. 4). Note: Ventilation can be achieved by introduction of fresh air to dilute contaminated air or by local exhaust of contaminated air. NFPA 402, 2002 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}