Categories of Face Mask (EN149:2001)
Categorisation of filter respiratory protective equipment (face masks) is defined in British Standard EN149:2001+A1:2009.
| Class |
Max permitted Total Inward Leakage (TIL) |
Max Filter Penetration | Min filter efficiency | Nominal Protection Factor |
Assigned Protection Factor (APF) |
| FFP1 | 22% | 20 | 80% | 4.5 | 4 |
| FFP2 | 8% | 6 | 94% | 12.5 | 10 |
| FFP3 | 2% | 1 | 99% | 50 | 20 |
Source: UK Health and Safety Executive