Section 74(5) in West Bengal Municipal (Building) Rules, 2007
(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.
