§ 57.8532. Opening and closing ventilation doors.
29 words·~1 min read·
/us/cfr/t30/s§ 57.8532·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
When ventilation control doors are opened as a part of the normal mining cycle, they shall be closed as soon as possible to re-establish normal ventilation to working places.