{"data":{"id":"us/30-cfr-75.343","jurisdiction":"us","citation":"30 CFR 75.343","heading":"Underground shops.","body":"(a) Underground shops shall be equipped with an automatic fire suppression system meeting the requirements of § 75.1107-3 through § 75.1107-16, or be enclosed in a noncombustible structure or area.\n(b) Underground shops shall be ventilated with intake air that is coursed directly into a return air course.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER O—COAL MINE SAFETY AND HEALTH","PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES","Subpart D—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":"a15040634dfe6aa70720cf60ab2a97aa4a819808f44891d0ace82f32abea12cb","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-75.342","next":"us/30-cfr-75.344"},"notice":"GroundRules: Original legal text. Not legal advice."}