NFPA 101 Chapter 12 addresses new assembly occupancies with specific requirements for seating, egress, and fire protection. Fixed seating must not block aisles. Aisle widths vary by row width, from 36 inches for narrow sections to 48 inches for main aisles. Dead-end aisles are limited to 20 feet. Two or more exits are required with no single-exit designs for large occupancies. Emergency lighting must illuminate all paths. Sprinkler systems and fire alarms are required in most assembly buildings. Occupant load must be posted at entry doors.