30 C.F.R. § 77.212 Draw-off tunnel ventilation fans; installation.
Title 30 - Mineral Resources
When fans are used to ventilate draw-off tunnels the fans shall be: (a) Installed on the surface; (b) Installed in fireproof housings and connected to the tunnel openings with fireproof air ducts; and, (c) Offset from the tunnel opening.
Title 30: Mineral Resources
PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES
Subpart C—Surface Installations
§ 77.212 Draw-off tunnel ventilation fans; installation.
