| (a) | the storage chamber shall be constructed with walls of brickwork of a thickness of not less than 35 centimetres rendered inside with cement plaster of a thickness of not less than 2.5 centimetres; |
| (b) | the roof or top of the chamber shall be of reinforced concrete at least 10 centimetres in thickness, and ventilators of approved pattern shall be provided in approved positions. If the chamber is a separate building the roof may be of corrugated iron or other non-inflammable materials as approved by the Director; |
| (c) | if the chamber is a separate building a copper lightning-conductor shall be provided leading to an earth-plate in a pit, well, river, or the sea, and shall be maintained in good order; |
| (d) | if the chamber is inside a building the floor level of the chamber shall be below ground level, a depth equal to at least half the height of the remainder of the chamber above ground level; |
| (e) | the door to the chamber shall be of steel or iron at least 3 millimetres in thickness and shall not exceed 1.5 metres in height and 0.9 metre in width. The sill of the door shall be at least 0.9 metre above the floor level and there shall be no other openings in the walls of the chamber; |
| (f) | the cubic capacity of the chamber up to the top of the wall inside shall not be more than 8.1 cubic metres for every 100 cases to be stored; and |
| (g) | the floor shall be laid in cement concrete not less than 10 centimetres in thickness and rendered with cement plaster not less than 2.5 centimetres in thickness. |