17A. [ Limits of temperature and air movement. (1) In any factory the maximum wet bulb temperature of air in a work-room at a height of 1.5 metres above the floor level shall not exceed 30° C and adequate air movement of at least 30 metres per minute shall be provided, and in relation to dry bulb temperature the wet bulb temperature in the work-room at the said height shall not exceed that shown in the schedule below, or as regards a dry bulb reading intermediate between the two dry bulb readings that specified in relation to the higher of these two dry bulb readings.]
