(225 ILCS 705/31.07) (from Ch. 96 1/2, par. 3107)

Sec. 31.07. The main current of air shall be so split or subdivided as to give a separate current of reasonably pure air to every 100 men at work, and the State Mine Inspector shall have authority to order, in writing, separate currents for smaller groups of men, if, in his judgment, special conditions render it necessary.

(Source: Laws 1953, p. 701.)