MSHA - Code of Federal Regulations - 30 CFR 77.212
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MSHA - Title 30 CFR
30 CFR § 77.212
Draw-off tunnel ventilation fans; installation.

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.