MSHA - Code of Federal Regulations - 30 CFR 18.22
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MSHA - Title 30 CFR
30 CFR § 18.22
Boring-type machines equipped for auxiliary face ventilation.

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.

For More Information: See MSHA's Program Policy Manual