(1) If soil-pipes and soil-ventilation pipes are placed inside a building within ducts, such ducts shall be provided with approved access.

(2) No soil-pipe or soil-ventilation shall be placed inside a kitchen, pantry, shop or business premises where food is, or is proposed to be, stored, prepared or sold unless, at the sole discretion of the local authority, such soil-pipe is enclosed in an impervious duct, in which case access to such duct shall be obtainable only from outside the room or apartment.

(3) If soil-pipes, waste-pipes, ventilation-pipes or other pipes placed in a building with totally enclosed shafts, such shafts shall be of an approved area, and shall have adequate means of access from each floor.

(4) Where necessary, an internal platform or floor, to the approval of the local authority, shall be provided at every floor-level.

(5) A cat-ladder or approved access-way shall be installed internally throughout the whole length of the shaft if so required by the local authority.

(6) The thickness of the wall of the shaft to which the pipes are fixed shall be to the approval of the local authority.