S-2.1, r. 15 - Regulation respecting safety and health in foundry works

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136. The air supplying the respirators shall:
(a)  be fresh and filtered;
(b)  be heated to at least 18 ºC if this air is from outside; and
(c)  provide a minimum flow of 3 dm3 per second for each respirator.
R.R.Q., 1981, c. S-2.1, r. 20, s. 136.