{"data":{"id":"us/30-cfr-57.22203","jurisdiction":"us","citation":"30 CFR 57.22203","heading":"Main fan operation (I-C mines).","body":"Main fans shall be operated continuously while ore production is in progress.","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":"1d8d6aa21225109678a6990e86c69f1e09270a67d45b5eb2fbce5e8db1ec4311","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-57.22202","next":"us/30-cfr-57.22204"},"notice":"GroundRules: Original legal text. Not legal advice."}