42 CFR § 84.142 - Air supply source; hand-operated or motor driven air blowers; Type A supplied-air respirators; minimum requirements.

---
identifier: "/us/cfr/t42/s84.142"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "42 CFR § 84.142 - Air supply source; hand-operated or motor driven air blowers; Type A supplied-air respirators; minimum requirements."
title_number: 42
title_name: "Public Health"
section_number: "84.142"
section_name: "Air supply source; hand-operated or motor driven air blowers; Type A supplied-air respirators; 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"
---


# 84.142 Air supply source; hand-operated or motor driven air blowers; Type A supplied-air respirators; minimum requirements.

(a) Blowers shall be designed and constructed to deliver an adequate amount of air to the wearer with either direction of rotation, unless constructed to permit rotation in one direction only, and to permit the free entrance of air to the hose when the blower is not operated.

(b) No multiple systems, whereby more than one user is supplied by one blower, will be approved, unless each hose line is connected directly to a manifold at the blower.