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State of West Bengal - Section

Section 121 in Kolkata Municipal Corporation Building Rules, 2009

121. Lighting and ventilation of rooms.

(1)Every habitable room, kitchen, staircase and bathroom or water-closet shall have, for the admission of light and air, one or more apertures, such as windows, glazed doors, fans and lights, opening directly to the external wall or into an open verandah.
(2)In any case where light and ventilation requirements are not met through day lighting and natural ventilation, the same shall be ensured through artificial lighting and mechanical ventilation, as per the latest provisions on Building Services of the latest edition of the National Building Code of India.Provided that in no case, the minimum aggregate area of the openings of habitable rooms and kitchen, excluding doors, shall not be less than one-tenth of the floor area.
(3)For ventilation of any room, including a bathroom or water closet or kitchen or any other room not intended to be used as an inhabited room if it does not open into the front, rear or side open space or an interior open space, it shall open into ventilation shaft which shall not be less than the specification in Table 7 and Table 7A below.Table 7Ventilation Shafts for Kitchen or Toilet
Height of the building (in m.) Minimum size of ventilation shaft (in sq. m.) Minimum width of the shaft (in m.)
Up to 12.5 2.5 1.2
Above 12.5 & upto 15.5 5.0 2.0
Above 15.5 & up to 20.0 6.0 2.4
Above 20.0 9.0 3.0
TABLE -7ACombined Ventilation Shaft for Kitchen and Toilet
Height of the building (in m.) Minimum size of ventilation shaft (in sq. m.) Minimum width of the shaft (in m.)
Up to 12.5 3.0 1.5
Above 12.5 & upto 15.5 6.5 2.5
Above 1 5.5 & upto 20.0 8.0 2.75
Above 20.0 9.0 3.0
Provided that for any building with a height exceeding 20 m., a mechanical ventilation system shall be installed in addition to the provisions of minimum ventilation shaft:Provided further that no chajja shall be allowed in any ventilation shaftProvided also that no ventilation shaft may be required for fully air-conditioned building, or mechanically ventilated toilet, kitchen, bath and water closet.