Table 3. Comparison of respirator approval standards for KF masks and FFP respirators [62,63].
| Filtering efficiency (%) | Test agent | Inhalation resistance- pressure drop (flow rate) | Total inward leakagea (%) | ||
|---|---|---|---|---|---|
| Korea | |||||
| KF80 | 80 | NaCl | ≤60 (at 30 L/min) | 25 | |
| KF94 | 94 | NaCl & paraffin oil | ≤70 (at 30 L/min) | 11 | |
| KF99 | 99 | NaCl & paraffin oil | ≤100 (at 30 L/min) | 5 | |
| Europe | |||||
| FFP1 | 80 | NaCl & paraffin oil | ≤60 (at 30 L/min), ≤210 (at 95 L/min) | 22b | |
| FFP2 | 94 | NaCl & paraffin oil | ≤70 (at 30 L/min), ≤240 (at 95 L/min) | 8b | |
| FFP3 | 99 | NaCl & paraffin oil | ≤100 (at 30 L/min), ≤300 (at 95 L/min) | 2b | |
FPP, filtering facepiece.
aAt least 46 of the 50 individual exercise results (10 subjects x 5 exercises) for total inward leakage shall not be greater than the requirements.
bFor European standards, at least 8 out of 10 individual wearers' arithmetic means for total inward leakage shall not be greater than the requirements as well.