Table 1.
Filtration test method requirements.
| Test | Level 1 | Level 2 | Level 3 | |
|---|---|---|---|---|
| ASTM F2299 (PFE) Filtration at 0.1 µm—28.3 L·min−1 |
95%≤ | 98%≤ | ||
| EN14683 (Breathing resistance—Breathability) |
≤49 Pa | ≤58.8 Pa | ||
| ASTM F2101 -19 (BFE) Filtration at 3 µm—28.3 L·min−1 |
95%≤ | 98%≤ | ||
| ASTM F2101 (VFE) Filtration at 3 µm—28.3 L·min−1 |
95%≤ | 98%≤ | ||
| ASTM F3502 Filtration at 0.3 µm—60 L/min | 20% £ | 50%≤ | - | |
| ASTM F3502 (Breathing resistance—Breathability) |
15 mmH2O (147.5 Pa) | 5 mmH2O (49 Pa) | - | |
| NIOSH 42 CFR 84 Filtration at 0.3 µm—85 L·min−1 |
N95 95%≤ |
|||
| Breathing resistance | Inhalation—120 L·min−1 | <314 Pa | ΔP < 98 Pa | |
| Exhalation—85 L·min−1 | <245 Pa | |||