30 C.F.R. § 18.22 Boring-type machines equipped for auxiliary face ventilation.
Title 30 - Mineral Resources
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.
Title 30: Mineral Resources
PART 18—ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND ACCESSORIES
Subpart B—Construction and Design Requirements
§ 18.22 Boring-type machines equipped for auxiliary face ventilation.
