---
kind: "section"
citation: "42 C.F.R. § 84.149"
title: "42"
number: "84.149"
heading: "Type C supplied-air respirator, demand and pressure demand class; minimum requirements."
url: "https://uscodex.org/cfr/42/84.149"
---

# §84.149. Type C supplied-air respirator, demand and pressure demand class; minimum requirements.

- (a) Respirators tested under this section shall be approved only when used to supply respirable air at the pressures and quantities required.
- (b) The manufacturer shall specify the range of air pressure at the point of attachment of the air-supply hose to the air-supply system, and the range of hose length for the respirator. For example, he might specify that the respirator be used with compressed air at pressures ranging from 280-550 kN/m. 2 (40 to 80 pounds per square inch) with from 6 to 76 m. (15 to 250 feet) of air-supply hose.
- (c) The specified air pressure at the point of attachment of the hose to the air-supply system shall not exceed 863 kN/m. 2 (125 pounds per square inch gage).
- (d)
  - (1) Where the pressure in the air-supply system exceeds 863 kN/m. 2 (125 pounds per square inch gage), the respirator shall be equipped with a pressure-release mechanism that will prevent the pressure at the point of attachment of the hose to the air-supply system from exceeding 863 kN/m. 2 (125 pounds per square inch gage).
  - (2) The pressure-release mechanism shall be set to operate at a pressure not more than 20 percent above the manufacturer's highest specified pressure. For example, if the highest specified pressure is 863 kN/m. 2 (125 pounds per square inch), the pressure-release mechanism would be set to operate at a maximum of 1,035 kN/m. 2 (150 pounds per square inch).

## 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.