Ventilation, temperature and humidity

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....supply, stagnant or vitiated air, harmful draughts, excessive heat or cold, sudden variations in temperature and where practicable, having regard to the nature of the processes carried on, to avoid excessive humidity or dryness, and objectionable odours; (ii) steps are taken as are necessary to provide at all workplaces of the belowground mine, adequate ventilation to clear away smoke, fu....