30 C.F.R. § 57.22208 Auxiliary fans (I-A, II-A, III, and V-A mines).
Title 30 - Mineral Resources
(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 ventilatioin. (b) Tests for methane shall be made at auxiliary fans before they are started.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart T—Safety Standards for Methane in Metal and Nonmetal Mines
Ventilation
§ 57.22208 Auxiliary fans (I-A, II-A, III, and V-A mines).
