Regulation 149—Magazine construction requirementsExcept with the prior approval of the Commission and subject to the conditions determined by the Commission, a manager shall ensure that each magazine for which that manager is responsible(a) has walls constructed of burnt bricks, concrete blocks, cement blocks, stone or any combination of these materials with the internal surface of each wall smooth-finished with cement plaster;(b) has a floor constructed of impermeable material and the floor is at least one hundred and fifty millimetres above the ground level;(c) has a ceiling(i) constructed of heat insulating and non inflammable material with adequate ventilation above the ceiling; or(ii) made of a wire mesh of substantial gauge;(d) which is licensed for the storage of more than one thousand cases of twenty-five kilogram of explosives, has two separate chambers consisting of a storage chamber and an entrance lobby through which a single access can be had to the storage chamber;(e) has an entrance consisting of a door or double doors, which opens outwards, is equipped with two locks of the type approved by the Chief Inspector and is made of steel lined with timber on the inside or made of stout timber faced with steel on the outside and, where the hinges are bolted to the door, the nuts are on the inside;(f) has adequate drainage to conduct water away from the magazine;(g) does not have an exposed iron or steel on the inside except the wire mesh ceiling permitted to be installed under paragraph (c) of this regulation; and (h) has adequate ventilation.(2) A manager may use a standard shipping container as an explosives magazine if the container(a) is wood lined on the inside and the fastening screws or nails used in the construction of the container or a part of the container are countersunk and covered with a suitable sealing material;(b) is provided with ventilation openings to allow for a flow of air through the magazine;(c) where made of steel or another metal has openings which are not more than 0.09 m2 with a minimum total open area of 1.0 m2, which are securely safeguarded, with the guards securely fixed to the structure;(d) is provided with drainage to prevent water from accumulating in the magazine;(e) where made of steel or another metal capable of conducting electricity, is earthed; and(f) is provided with a shade roof.