Motormen, trip riders, and drivers in charge of haulage trips, passing through doors used as a means of directing the ventilation, shall see that such doors are closed promptly after the trip passes through.No person shall refuse or neglect to comply with this section.
Closing of ventilating doors
Ohio Rev. Code Ann. § 1567.15, under Chapter 1567 | Mine Equipment; Safety Provisions.
Ohio Rev. Code Ann. § 1567.15