{"data":{"id":"us/42-cfr-84.178","jurisdiction":"us","citation":"42 CFR 84.178","heading":"Breath response type, airflow resistance test—PAPR classes HE and PAPR100.","body":"Resistance to airflow will be measured with a breathing machine as described in § 84.88.\n(a) Minimum inhalation resistance must be greater than zero mm of water-column height.\n(b) Maximum exhalation resistance must be less than 89 mm of water-column height.","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":"df34503a1b733224ae86f5aa18c0ae4184b93bf05eab5233f4a53ae2ac8ad537","source_id":"us-cfr","stale":true,"prev":"us/42-cfr-84.177","next":"us/42-cfr-84.179"},"notice":"GroundRules: Original legal text. Not legal advice."}