---
kind: "section"
citation: "42 C.F.R. § 84.178"
title: "42"
number: "84.178"
heading: "Breath response type, airflow resistance test—PAPR classes HE and PAPR100."
url: "https://uscodex.org/cfr/42/84.178"
---

# §84.178. Breath response type, airflow resistance test—PAPR classes HE and PAPR100.


Resistance to airflow will be measured with a breathing machine as described in [§ 84.88](/cfr/42/84.88.md).

- (a) Minimum inhalation resistance must be greater than zero mm of water-column height.
- (b) Maximum exhalation resistance must be less than 89 mm of water-column height.

## 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.