All fan houses, tops of air and escape shafts, and fan drifts, shall be constructed of the above materials, or a combination of them. Wood may be used only for floors, windows, doors and frames in the construction of such structures.
225 ILCS 705/14.01
All buildings and structures erected, after the effective date of this Act, over a shaft, slope, or drift mouth within 100 feet of the opening shall be of metal, rock, clay, cement, clay or cement products, or any combination thereof
Laws 1953, p. 701.
Official source: Illinois General Assembly. Reproduced from public-domain Illinois statutes; confirm against the official source for the current text. Not legal advice.