AUXILIARY FANS
No auxiliary fan shall be started, stopped, removed, replaced or in any way altered or interfered with,except by or on the authority of an official.,No person shall enter or remain in any place which is dependent for its ventilation on an auxiliary fan,unless such fan is operating efficiency.Whenever the ventilation of any such place has been interrupted,whether by the stoppage of the fan or otherwise,no person shall so enter or remain their in except for the propose of restoring the ventilation or unless the place has been examined by a competent person and declared safe. Every auxiliary fan: shall be installed,located,and worked in such a manner that; a sufficient quantity of air shall,at all times,reach it so as to ensure that it does not recirulate air and there is no risk of the air which it circulates being contaminated by any substantial quantity of inflammable or noxious gases or dust.Shall have an air duct for conducting the air to or from the face or b...