---
kind: "section"
citation: "42 C.F.R. § 84.200"
title: "42"
number: "84.200"
heading: "Inhalation and exhalation valves; minimum requirements."
url: "https://uscodex.org/cfr/42/84.200"
---

# §84.200. Inhalation and exhalation valves; minimum requirements.

- (a) Inhalation and exhalation valves shall be provided where necessary and protected against distortion.
- (b) Inhalation valves shall be designed and constructed to prevent excessive exhaled air from entering cartridges or adversely affecting canisters.
- (c) Exhalation valves shall be—
  - (1) Protected against damage and external influence; and
  - (2) **Designed and constructed to prevent inward leakage of contaminated air.**

## Notes

### 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.