Clause 6

Every workroom shall be provided with adequate natural ventilation by means of one or more windows or openings having a total area of at least 10% of the floor area of the room.(2) In any workplace where natural ventilation is impracticable or inadequate, effective and suitable mechanical ventilation shall be provided such that the fresh air supply (except for air-conditioned areas) shall not be less than 0.5 cubic metre per minute per square metre floor area and 0.3 cubic metre per minute per person.(3) Where gases, vapours or other impurities are generated in the course of any process or work carried out in a workplace which may be injurious to health, effective and suitable ventilation shall be provided for securing and maintaining the circulation of fresh air in the workplace, to render harmless so far as is practicable, all such gases, vapours or other impurities.(4) This section shall not apply to any workplace where it is impracticable to make provision for adequate ventilation and where suitable air-supplied breathing apparatus is used by persons working in the workplace.”.