Maximum Resistance
[mm. water-column height]
Type of gas mask | Inhalation | Exhalation | |
Initial | Final1 | ||
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.
42 C.F.R. §84.122