---
kind: "unit"
title: "42"
title_heading: "Public Health"
key: "chI/subchG/part84/subpartI"
level: "subpart"
label: "Subpart I"
heading: "Gas Masks"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/42/chI-subchG-part84-subpartI"
sections_count: 17
---

# Subpart I — Gas Masks

Title 42 C.F.R. — Public Health › Chapter I — Public Health Service, Department of Health and Human Services › Subchapter G — Occupational Safety and Health Research and Related Activities › Part 84 — Approval of Respiratory Protective Devices

## Sections

- [§84.110. Gas masks; description.](/cfr/42/84.110.md)
- [§84.111. Gas masks; required components.](/cfr/42/84.111.md)
- [§84.112. Canisters and cartridges in parallel; resistance requirements.](/cfr/42/84.112.md)
- [§84.113. Canisters and cartridges; color and markings; requirements.](/cfr/42/84.113.md)
- [§84.114. Filters used with canisters and cartridges; location; replacement.](/cfr/42/84.114.md)
- [§84.115. Breathing tubes; minimum requirements.](/cfr/42/84.115.md)
- [§84.116. Harnesses; installation and construction; minimum requirements.](/cfr/42/84.116.md)
- [§84.117. Gas mask containers; minimum requirements.](/cfr/42/84.117.md)
- [§84.118. Half-mask facepieces, full facepieces, and mouthpieces; fit; minimum requirements.](/cfr/42/84.118.md)
- [§84.119. Facepieces; eyepieces; minimum requirements.](/cfr/42/84.119.md)
- [§84.120. Inhalation and exhalation valves; minimum requirements.](/cfr/42/84.120.md)
- [§84.121. Head harnesses; minimum requirements.](/cfr/42/84.121.md)
- [§84.122. Breathing resistance test; minimum requirements.](/cfr/42/84.122.md)
- [§84.123. Exhalation valve leakage test.](/cfr/42/84.123.md)
- [§84.124. Facepiece tests; minimum requirements.](/cfr/42/84.124.md)
- [§84.125. Particulate tests; canisters containing particulate filters; minimum requirements.](/cfr/42/84.125.md)
- [§84.126. Canister bench tests; minimum requirements.](/cfr/42/84.126.md)