From Table 4.2.3, the effective width, We, of each door is 0.91 - 0.3 = 0.61 m.
The maximum specific flow, Fsm, for the doorway (from Table 4.2.7) is 1.32 persons/s/m effective width.
Specific flow, FS, equals maximum specific flow, Fsm, Therefore, using Equation 4, the flow from each stairway is limited to 1.32 X 0.61 = 0.805 persons/s (48.30 persons/min).
Since the flow capacity of the doors is less than the flow capacity of the stairway served, the flow is controlled by the stairway exit doors (0.805 persons/stairway exit door/s).