---
kind: "section"
citation: "42 C.F.R. § 84.172"
title: "42"
number: "84.172"
heading: "Airflow resistance test."
url: "https://uscodex.org/cfr/42/84.172"
---

# §84.172. Airflow resistance test.

- (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](/cfr/42/84.173.md).
- (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:

## Notes

### Source

Source: 85 FR 20608, Apr. 14, 2002, unless otherwise noted.

### Authority

Authority: 29 U.S.C. 651 et seq.; 30 U.S.C. 3, 5, 7, 811, 842(h), 844.

### Source

Source: 60 FR 30355, June 8, 1995, unless otherwise noted.