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N95 respirator fitted filtration efficiency (FFE) against submicron particles for shaved and unshaven men.
| Subject | Average beard length (mm) | % FFE (SD)a |
|---|---|---|
| N95 | ||
| 1 | 0 | 99.4 (0.5) |
| 2 | 0 | 99.3 (0.4) |
| 3 | 0 | 99.1 (0.3) |
| 4 | 0 | 99.0 (0.5) |
| 5 | 0 | 97.6 (1.8) |
| Average | 98.9 | |
| 6 | 9 | 96.9 (1.1) |
| 7 | 9.8 | 97.1 (1.0) |
| 8 | 11.2 | 98.4 (0.4) |
| 9 | 15.7 | 85.0 (3.0) |
| 10 | 30.4 | 98.8 (0.4) |
| Average | 95.2 | |
aThe efficiency is calculated as [1 – (mask count/ambient count)] × 100 across the length of the test. The FFE ± SD are shown.
