Section 4: Indoor installations

4. Indoor installations (1) Access shall always be as easy as practicably possible, and stores shall normally be placed at ground level with doors and gates without any steps to facilitate internal transport. (2) Depending on the properties of the chemicals, the doors shall give access directly to the open, for instance when storing highly flammable or volatile chemicals. (3) The following precautions shall be taken— (a) the temperature of the store shall not exceed 40 degrees centigrade and cooling shall be provided if necessary; (b) necessary equipment to keep the humidity of the store within specific allowed range and for drying the air shall be provided; (c) sufficient natural or adequate mechanical ventilation shall be provided to prevent the formation of dangerous vapour-concentrations or odour; (d) if loss of containment may be expected and the vapours are toxic or potent to health, the ventilation shall be started automatically using a suitable detector or operated from outside; (e) lighting devices according to standards shall be installed depending on operations to be carried out.