30 CFR § 57.22220
Air passing unsealed areas (I-A, II-A, III, and V-A mines)
July 29, 2020
Air that has passed by or through unsealed abandoned or unsealed inactive areas and contains 0.25 percent or more methane shall—
(a) Be coursed directly to a return airway;
(b) Be tested daily for methane by a competent person; and
(c) Not be used to ventilate work places.
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