{"data":{"id":"us/42-cfr-84.51","jurisdiction":"us","citation":"42 CFR 84.51","heading":"Entry and escape, or escape only; classification.","body":"Respirators described in subparts H through L of this part shall be classified for use as follows:\n(a) Entry and escape. Respirators designed and approved for use during entry into a hazardous atmosphere, and for escape from a hazardous atmosphere; or\n(b) Escape only. Respirators designed and approved for use only during escape from a hazardous atmosphere.","path":["Title 42—Public Health","CHAPTER I—PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER G—OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES","PART 84—APPROVAL OF RESPIRATORY PROTECTIVE DEVICES","Subpart F—Classification of Approved Respirators; Scope of Approval; Atmospheric Hazards; Service Time"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-42.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:11Z","sha256":"d375a7b9cabdfa579a3d37583341894b6d41600c6fb05db60bda00ded1216ea5","source_id":"us-cfr","stale":true,"prev":"us/42-cfr-84.50","next":"us/42-cfr-84.52"},"notice":"GroundRules: Original legal text. Not legal advice."}