Section 27(10)(b) in The Merchant Shipping (Crew Accommodation) Rules, 1960
(b)The separate compartments in each battery shall be not less than 1.14 metres in length by 91.44 centimetres in width. Each such compartment shall have a separate entry fitted with a door with two shutters opening inwards which can be secured from the inside. The door need not extend to the full height of the compartment, but it shall not be less than 1.37 metres in height and 61.00 centimetres in width and the vertical height of the opening at the bottom shall not exceed 10.2 centimetres. The divisional bulk-heads between the compartments should extend to a height of within 30.5 centimetres should extend to a height of within 30.5 centimetres of the deck overhead and may also be opened at the bottom to the same extent and should be fitted with suitable hand grips. There shall be an enclosed passageway leading to the compartments of not less than 76.20 centimetres in breadth.