42 CFR § 84.140 - Air velocity and noise levels; hoods and helmets; minimum requirements.

---
identifier: "/us/cfr/t42/s84.140"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "42 CFR § 84.140 - Air velocity and noise levels; hoods and helmets; minimum requirements."
title_number: 42
title_name: "Public Health"
section_number: "84.140"
section_name: "Air velocity and noise levels; hoods and helmets; minimum requirements."
chapter_name: "PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "G"
subchapter_name: "OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES"
part_number: "84"
part_name: "APPROVAL OF RESPIRATORY PROTECTIVE DEVICES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "29 U.S.C. 651  30 U.S.C. 3, 5, 7, 811, 842(h), 844."
regulatory_source: "60 FR 30355, June 8, 1995, unless otherwise noted."
cfr_part: "84"
---


# 84.140 Air velocity and noise levels; hoods and helmets; minimum requirements.

Noise levels generated by the respirator will be measured inside the hood or helmet at maximum airflow obtainable within pressure and hose length requirements and shall not exceed 80 dBA.