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Federal regulations · Through 2026-08-25 · Newer source version available

42 CFR 84.172: Airflow resistance test.

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Where this section sits in the code
  1. Title 42—Public Health
  2. CHAPTER I—PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES
  3. SUBCHAPTER G—OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES
  4. PART 84—APPROVAL OF RESPIRATORY PROTECTIVE DEVICES
  5. Subpart K—Air-Purifying Particulate Respirators

(a) Resistance to airflow will be measured in the tight-fitting respiratory inlet covering of a complete particulate respirator mounted on a test fixture with air flowing at continuous rate of 85 ±2 liters per minute, before each test conducted in accordance with § 84.173.

(b) Resistance of a complete tight-fitting powered air-purifying particulate respirator system will be measured with the blower off if the manufacturer indicates that the respirator should not be doffed in the event of a blower failure.

(c) The maximum allowable resistance requirements for air-purifying particulate respirators are as follows:

Maximum Resistance

[mm water-column height]

Respirator type Inhalation Exhalation

Initial Final

Non-Powered (N, R, and P) 35 N/A 25

Powered (tight fitting) (HE class and PAPR100 class) 50 70 20

Collected 2026-08-27T02:26:11Z. Source file · JSON

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