Paragraph 37
The stoppage of any ventilating apparatus (other than an auxiliary fan) for over 30 minutes, except for planned maintenance, which causes a reduction in mine ventilation resulting in dangerous levels of noxious or flammable gases.
The stoppage of any ventilating apparatus (other than an auxiliary fan) for over 30 minutes, except for planned maintenance, which causes a reduction in mine ventilation resulting in dangerous levels of noxious or flammable gases.