§77.212. Draw-off tunnel ventilation fans; installation.
30 C.F.R. § 77.212
When fans are used to ventilate draw-off tunnels the fans shall be:
Installed on the surface;
Installed in fireproof housings and connected to the tunnel openings with fireproof air ducts; and,
Offset from the tunnel opening.
Notes, amendments, and revision history
Authority
Authority: 30 U.S.C. 811.
Source
Source: 36 FR 9364, May 22, 1971, unless otherwise noted.