Content Page: 40 Ventilation Outlets

(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…