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

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104.1. In a raise:
1°  notwithstanding section 104, the ventilation flow in the work station shall supply at least 5 changes of air per hour;
2°  ventilation shall be supplied by means of a compressed air pipe that is:
a)  less than 6.1 m (20 ft) from the heading;
b)  equipped with a muffler;
c)  directed towards the heading;
d)  independent of any compressed air pipe supplying a drill or other pneumatic tool.
O.C. 782-97, s. 15.