(225 ILCS 705/17.05) (from Ch. 96 1/2, par. 1705)
Sec. 17.05.
In crosscuts connecting main and cross entry inlet and outlet
air courses, the permanent stoppings shall be erected of masonry, concrete,
or other incombustible material, and shall be erected within 600 feet of
the face of main and cross entries at all times. Temporary stoppings of
wood or other equally effective material shall be maintained, as nearly air
tight as possible, between the last permanent stopping and the cross cut
nearest the face in main and cross entries. In room and stub entries the
stoppings shall be built of wood or other equally effective material. All
stoppings shall be kept in good condition, so as to keep the air up to the
working faces.
(Source: Laws 1953, p. 701.)
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