S-2.1, r. 14 - Regulation respecting occupational health and safety in mines

Full text
107. The air flow control devices for ventilating a raise shall be:
(1)  designed so that a minimum ventilation of 5 changes of air per hour is maintained in the work station at all times;
(2)  placed outside and less than 10 m (32.8 ft) from the raise.
O.C. 213-93, s. 107; O.C. 782-97, s. 16.