Double-Row Racks 2 : Two single-row racks placed back-to-back having a combined width up to 3. 7 m (12 ft) with aisles of atleast 1. 1 m (3. 5 ft) on each side. NFPA 13, 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}