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11. No drain shall be laid on the premises until the drain from the sewer to the
premises has been laid in accordance with the above regulation.
12. For the effectual ventilation of the drains at least two untrapped openings shall be
provided.
(a) One opening, being at or near the level of the surface of the ground, communicating
with the drains by means of a suitable pipe, shaft, or disconnecting chamber,
as near as practicable to the trap, which shall be provided between the main
drain of the building and the sewer with which such drain communicates ; such
opening shall be situate on that side of the trap nearer the building.
(b) The second opening shall be obtained by carrying up from the point or head of the
drains farthest distant from the first mentioned opening, an iron ventilating
pipe not less than three inches internal diameter, fitted with perfectly tight
joints and wire guard covering at top, carried up to such a height and in such a
manner as effectually to prevent any escape of foul air from such pipe or shaft
into any building in the vicinity thereof.
13. A suitable trap to be provided in every main drain which directly communicates
with the sewer at a point as distant as may be practicable from the building, within the
curtilage thereof, and as near as may be practicable to the point at which such drain may be
connected with the sewer. Unless absolutely unavoidable, no disconnecting syphon or shaft
covering can be permitted in the footway of any street.
14. Immediately above the disconnecting trap a suitable inspection chamber shall be
constructed, provided with air-tight cover.
15. Junctions of branch drains shall in no case be made at right angles, but with
proper junction pipes, having the branch pipe formed on them at an angle of 45 to 60
degrees, with the main drain in the direction of the flow; no cutting of pipes will be
sanctioned, and no vertical right angle junction will be allowed except as inspection shafts,
or for ventilation purposes.