30 CFR Part 57Public Domain
§ 57.22222 — Ventilation materials (I-A, I-B, I-C, II-A, III, V-A, and V-B mines)
Subpart T — Safety Standards for Methane in Metal and Nonmetal Mines
Brattice cloth and ventilation tubing shall be approved by MSHA in accordance with 30 CFR part 7, or shall bear a BC or VT acceptance number issued by the MSHA Approval and Certification Center.
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.