{"data":{"id":"us-va/4vac25-40-5580","jurisdiction":"us-va","citation":"4VAC25-40-5580","heading":"Airflow to be maintained","body":"Airflow shall be maintained in all intake and return air courses of a mine.  When multiple main fans are used, such ventilation systems shall not develop areas without perceptible air movement.","path":["Title 4. Conservation And Natural Resources","Agency 25. Department of Energy","Chapter 40. Safety and Health Regulations for Mineral Mining","Part XV. Safety and Health Regulations—Underground Only","Article 11. Gassy Mines"],"source_url":"https://law.lis.virginia.gov/admincode/title4/agency25/chapter40/section5580/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:46:11Z","sha256":"7e2845b5acc7422517b57c485ca44f822f45a642d7a6775bcaee7e5c030b7161","source_id":"us-va-vac","stale":false,"prev":"us-va/4vac25-40-5570","next":"us-va/4vac25-40-5590"},"notice":"GroundRules: Original legal text. Not legal advice."}