Section 12(2)(e) in Multi-Storeyed and Public Buildings Rules, 1973
(e)Width of any exit shall not be less than 100 cm. and shall be determined for the total number of occupants as specified in the following Table. The unit of exit width for measuring the capacity of exits shall be 50 cm. A clear width of 25 cm. shall be at an additional half unit and clear width less than 25 cm. shall not be covered for exit width.