{"data":{"id":"us/42-cfr-84.173","jurisdiction":"us","citation":"42 CFR 84.173","heading":"Exhalation valve leakage test.","body":"(a) Dry exhalation valves and valve seats will be subjected to a suction of 25 mm water-column height while in a normal operating position.\n(b) Leakage between the valve and valve seat must not exceed 30 mL per minute.","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 K—Air-Purifying Particulate Respirators"],"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":"affcb03b323050f4bff65034871aacda76306593972908d008b80d38eba6a5f9","source_id":"us-cfr","stale":true,"prev":"us/42-cfr-84.172","next":"us/42-cfr-84.174"},"notice":"GroundRules: Original legal text. Not legal advice."}