Section 61(10)(u) in The West Bengal Factories Rules, 1958
(u)An exit door shall not open immediately upon a flight of stairs : A landing, at least 1.5m x 1.5m in size shall be provided in the stairway at each doorway. The level of landing shall be the same as that of the floor which it serves.] [Substituted by W. B. Factories (Amendment) Rules, 1991 dated 27.11.1991]