{"data":{"id":"us/42-cfr-84.77","jurisdiction":"us","citation":"42 CFR 84.77","heading":"Inhalation and exhalation valves; minimum requirements.","body":"(a) Inhalation and exhalation valves shall be provided where necessary and protected against damage and distortion.\n(b) Exhalation valves shall be—\n(1) Protected against external influence; and\n(2) Designed and constructed to prevent inward leakage of contaminated air.","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 H—Self-Contained Breathing Apparatus"],"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":"9aaa0965d70a14e693b73b8fe3f817a3bfed0fb11702137d19f0acde00124878","source_id":"us-cfr","stale":true,"prev":"us/42-cfr-84.76","next":"us/42-cfr-84.78"},"notice":"GroundRules: Original legal text. Not legal advice."}