(1) Every vent-pipe or anti-siphon pipe shall be carried upwards without diminution of diameter to a height of at least 4,5 metres above finished ground-level, 300 millimetres above place of emergence through the roof, or 1 metre above eaves-level, whichever is the greatest height, or to such greater height or to such position as the local authority may require, having regard to the amenity of adjoining property.

(2) The open end of any vent passing through, or attached to, a building shall be not less than 2 metres above the head of any window, door or other opening in that building or in any other building which is within a horizontal distance of 6 metres of the said open end:

Provided that, where access to the upper surface of the roof or any part thereof is provided for any purpose other than that of maintenance or repair, the pipe shall, unless local authority otherwise permits, extend at least 2,5 meters above such roof or part thereof.

(3) Where any new building or any addition to an existing building has any windows, doors or other openings so placed that the provisions of subsection (2) are contravened in respect of an existing vent, whether on the same or any other property, the owner of such owner new building or addition shall, at his own expense, do all such things as may be necessary to bring such existing vent into compliance with the said subsection.

(4) No chimney or other flue shall be used for ventilating any sewer-pipe, soil-pipe or waste-pipe.

(5) The open end of every vent shall be surmounted by an approved wire cage grating having apertures of an aggregate area not less than the sectional area of the pipe.