---
kind: "section"
citation: "42 C.F.R. § 84.173"
title: "42"
number: "84.173"
heading: "Exhalation valve leakage test."
url: "https://uscodex.org/cfr/42/84.173"
---

# §84.173. Exhalation valve leakage test.

- (a) Dry exhalation valves and valve seats will be subjected to a suction of 25 mm water-column height while in a normal operating position.
- (b) Leakage between the valve and valve seat must not exceed 30 mL per minute.

## 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.