A single wheelchair space shall be 36 inches (915 mm) wide minimum Where two adjacent wheelchair spaces are provided, each wheelchair space shall be 33 inches (840 mm) wide minimum.
Definition of RTU in Construction Roof top units. The RTU is a piece of mechanical equipment that is designed to heat, cool, ventilate by providing air flow for any combination of the three.
FCU is fan coil unit which is intalled for samll capacities and have less options than AHU like no humidity control and no special options for heat recovery of air filters. AHU means Air Handling Units and are available in number of varities and tonnages from small upto large capacities.