84.122—Breathing resistance test; minimum requirements.
(a)
Resistance to airflow will be measured in the facepiece or mouthpiece of a gas mask mounted on a breathing machine both before and after each test conducted in accordance with §§ 84.124, 84.125, and 84.126, with air flowing at a continuous rate of 85 liters per minute.
| [mm. water-column height] | |||
| Type of gas mask | Inhalation | Exhalation | |
|---|---|---|---|
| Initial | Final 1 | ||
| Front-mounted or back-mounted (without particulate filter) | 60 | 75 | 20 |
| Front-mounted or back-mounted (with approved particulate filter) | 70 | 85 | 20 |
| Chin-style (without particulate filter) | 40 | 55 | 20 |
| Chin-style (with approved particulate filter) | 65 | 80 | 20 |
| Escape (without particulate filter) | 60 | 75 | 20 |
| Escape (with approved particulate filter) | 70 | 85 | 20 |
| 1 Measured at end of the service life specified in Tables 5, 6, and 7 of this subpart. | |||