42 CFR 84.153 - Airflow resistance test, Type A and Type AE supplied-air respirators; minimum requirements.

§ 84.153 Airflow resistance test, Type A and Type AE supplied-air respirators; minimum requirements.
(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.
(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:
Maximum length of hose for which respirator is approved Maximum resistance, water column height
Feet Meters Inches Millimeters
75 23 1.5 38
150 46 2.5 64
250 76 3.5 89
300 91 4.0 102
(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.

Title 42 published on 2014-10-01

no entries appear in the Federal Register after this date.

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United States Code
U.S. Code: Title 29 - LABOR

29 U.S. Code § 301 to 309 - Repealed.

§ 651 - Congressional statement of findings and declaration of purpose and policy

§ 652 - Definitions

§ 653 - Geographic applicability; judicial enforcement; applicability to existing standards; report to Congress on duplication and...statutory rights, duties, or liabilities of employers and employees unaffected

§ 654 - Duties of employers and employees

§ 655 - Standards

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§ 675 - Annual reports by Secretary of Labor and Secretary of Health and Human Services; contents

§ 676 - Omitted

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§ 678 - Authorization of appropriations

U.S. Code: Title 30 - MINERAL LANDS AND MINING