§ 77.212. Draw-off tunnel ventilation fans; installation.
39 words·~1 min read·
/us/cfr/t30/s§ 77.212·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
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.