30 CFR Part 57Public Domain
§ 57.22208 — Auxiliary fans (I-A, II-A, III, and V-A mines)
Subpart T — Safety Standards for Methane in Metal and Nonmetal Mines
(a)Auxiliary fans, except fans used in shops and other areas which have been so designed that methane cannot enter the airway, shall be approved by MSHA under the applicable requirements of 30 CFR part 18, and be operated so that recirculation is minimized. Auxiliary fans shall not be used to ventilate work places during the interruption of normal mine ventilation.
(b)Tests for methane shall be made at auxiliary fans before they are started.
Public Domain: 30 CFR Part 57 (MSHA Safety and Health Standards — Underground Metal and Nonmetal Mines) is a U.S. government publication and is not subject to copyright. Text extracted from the official source ↗. Figures are served from the eCFR; if one does not load, use the link in its place.