(a)if no mechanical means for general ventilation and for reduction of temperature is employed, and(i)the width of the room exceeds 18 meters (59 ft.) or its floor area exceeds 560 sq. meters (6,128 sq. feet), the aggregate area of ventilating openings as approved or directed by the Chief Inspector:(ii)the width of the room does not exceed 18 meters or its floor area does not exceed 560 sq. meters, the aggregate area of ventilating openings is not less than the area found from the applicable formula in Appendix I :
