Section 69 in The Haryana New Mandi Townships Building Rules, 1967
69. Construction of ventilation pipes - [Section 4(2)(1)].
- A ventilating pipe to a drain and the part of soil pipe from a water closet or slop sink which is carried up as a ventilating pipe shall -(i)be formed of suitable material to secure adequate durability and this requirement shall be deemed to be satisfied if new cast iron pipes conforming to British Standard Specification No. 416-1935 for medium grade pipes or lead pipes, conforming to either British Standard Specification No. 602-1939 or No. 603-1935 are used;(ii)be not less than 75 milimetres (2.9528") in internal diameter;(iii)be carried upwards to such a height and in such manner as effectually to prevent the escape of foul air from the drains into any buildings;(iv)be covered at its open end, as a protection against obstruction, with a wire cage of copper or galvanised iron or other not less suitable cover admitting the free passage of air.
