{"data":{"id":"us/30-cfr-57.8525","jurisdiction":"us","citation":"30 CFR 57.8525","heading":"Main fan maintenance.","body":"Main fans shall be maintained according to either the manufacturer's recommendations or a written periodic schedule adopted by the operator which shall be available at the operation on request of the Secretary or his authorized representative.","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 G—Ventilation"],"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":"70a0835bf6b73510fdbd504873da311d93d91e242220725c34520728ac4e736e","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-57.8520","next":"us/30-cfr-57.8527"},"notice":"GroundRules: Original legal text. Not legal advice."}