Section 74 in West Bengal Municipal (Building) Rules, 2007
74. Lighting and ventilation of room.
(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 and fan lights, opening directly to the external or air 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 of section 1 of Lighting and Ventilation of Part VIII on Building Services of the latest edition of the National Building Code of India :Provided that the minimum aggregate area of the openings of habitable rooms and kitchens, excluding doors, shall in no case be less than one-tenth of the floor area.(3)No portion of any habitable room shall be assumed to be lighted if it is more than 7.5 metres from the opening assumed for lighting that portion.(4)The planning, design and installation of lighting and ventilation, electrical installations and fittings, air-conditioning and heating work, acoustics, sound insulation and noise control and the number, type and installations of lifts and escalators shall be carried out in accordance with the provisions of building services of the latest edition of the National Electrical Code of India :Provided that for electrical installation in respect of any building the provisions of the latest edition of the National Electrical Code and the rules made under the Electricity Act, 2003, shall apply.(5)For ventilating water closet and bathroom, such water closet or bathroom, if not opening to front open space, side open space, rear open space or interior open space, shall open on to a ventilation shaft as per provisions of sub-rule (5)(b) of rule 50 :Provided that the planning, design, construction and installation of water supply, drainage, sanitation and gas supply systems shall be in accordance with the provisions of plumbing services of the latest edition of National Code of India.
