{"data":{"id":"us/42-cfr-84.153","jurisdiction":"us","citation":"42 CFR 84.153","heading":"Airflow resistance test, Type A and Type AE supplied-air respirators; minimum requirements.","body":"(a) Airflow resistance will be determined when the respirator is completely assembled with the respiratory-inlet covering, the air-supply device, and the maximum length of air-supply hose coiled for one-half its length in loops 1.5 to 2.1 m. (5 to 7 feet) in diameter.\n(b) The inhalation resistance, drawn at the rate of 85 liters (3 cubic feet) per minute when the blower is not operating or under any practical condition of blower operation shall not exceed the following amounts:\nMaximum length of hose for which respirator is approved Maximum resistance, water column height\nFeet Meters Inches Millimeters\n75 23 1.5 38\n150 46 2.5 64\n250 76 3.5 89\n300 91 4.0 102\n(c) The exhalation resistance shall not exceed 25 mm. (1 inch) of water-column height at a flow rate of 85 liters (3 cubic feet) per minute when the blower is not operating or under any practical condition of blower operation.","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 J—Supplied-Air 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":"878c80493eb5067dc2b226284a78533fadaaf154f9597734fc42574521b28a90","source_id":"us-cfr","stale":true,"prev":"us/42-cfr-84.152","next":"us/42-cfr-84.154"},"notice":"GroundRules: Original legal text. Not legal advice."}