{"data":{"id":"us/30-cfr-57.22201","jurisdiction":"us","citation":"30 CFR 57.22201","heading":"Mechanical ventilation (I-A, I-B, I-C, II-A, II-B, III, IV, V-A, and V-B mines).","body":"All mines shall be ventilated mechanically.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH","PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES","Subpart T—Safety Standards for Methane in Metal and Nonmetal Mines"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"d1257d9e35c2a31ea95a68ed20533700ac45fe8b79d1867c163af247cd24aaf6","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-57.22106","next":"us/30-cfr-57.22202"},"notice":"GroundRules: Original legal text. Not legal advice."}