(3)Other requirements. - Every bathroom or water-closet shall,-(a)be so situated that at least one of its walls shall open to external air;(b)not be directly over or under any room other than another water-closet, washing place, bath or terrace, unless it has a water tight floor;(c)have the platform or seat made of watertight non-absorbent material;(d)be enclosed by wall or partitions and the surface of every such wall or partition shall be finished with a smooth impervious material to a height of not less than 1 metre above the floor of such a room;(e)be provided with an impervious floor covering, sloping towards the drain with a suitable grade and not towards verandah or any other room; and(f)have a window or ventilator, opening to a shaft or open space, of area not less than 3 square metres with side not less than 0.3 metre.
