§ 18.22 Boring-type machines equipped for auxiliary face ventilation.
Current through Jul 27, 2026 · Read all of Part 18
Each boring-type continuous-mining machine that is submitted for approval shall be constructed with an unobstructed continuous space(s) of not less than 200 square inches total cross-sectional area on or within the machine to which flexible tubing may be attached to facilitate auxiliary face ventilation.