Rack, Single-Row : Racks that have no longitudinal flue space and that have a width up to 6 ft (1. 8 m) with aisles at least 3. 5 ft (1. 1 m) from other storage
NFPA 230 Standard for the Fire Protection of Storage 1999 ed. http://www.nfpa.org/assets/files/aboutthecodes/230 /230-f2002-rop.pdf, (Std: Fr Prac of Storage - Amer) {267 NFC}