Line brattices or other suitable devices shall be installed from the last open crosscut to a point near the face to ensure positive air flow to the face of every active underground working area, unless the director or his authorized representative permits an exception to this requirement.
4 Va. Admin. Code § 25-40-5400
Statutory Authority
§§ 45.1-161.3, 45.1-161.294 and 45.1-161.305 of the Code of Virginia.