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Table 4 Standards for facepiece respirators

From: Addressing the worldwide shortages of face masks

Certification/class (standard) N95(NIOSH-42CFR84) FFP2 (EN 149-2001) KN95 (GB2626-2006) P2 (AS/NZ 1716:201) Korea 1st Class (KMOEL - 2017-64) DS (Japan JMHLW Notification 214, 2018)
Filter performance – (must be ≥ X % efficient) ≥ 95% ≥ 94% ≥ 95% ≥ 94% ≥ 94% ≥ 95%
Test agent NaCl NaCl and paraffin oil NaCl NaCl NaCl and paraffin oil NaCl
Flow rate 85 L/min 95 L/min 85 L/min 95 L/min 95 L/min 85 L/min
Total inward leakage (TIL)*– tested on human subjects each performing exercises N/A ≤ 8% leakage (arithmetic mean) ≤ 8% leakage (arithmetic mean) ≤ 8% leakage (individual and arithmetic mean) ≤ 8% leakage (arithmetic mean) Inward Leakage measured and included in User Instructions
Inhalation resistance – max pressure drop ≤ 343 Pa ≤ 70 Pa (at 30 L/min) ≤ 240 Pa (at 95 L/min) ≤ 500 Pa (clogging) ≤ 350 Pa ≤ 70 Pa (at 30 L/min) ≤ 240 Pa (at 95 L/min) ≤ 70 Pa (at 30 L/min) ≤ 240 Pa (at 95 L/min) ≤ 70 Pa (w/valve) ≤ 50 Pa (no valve)
Flow rate 85 L/min Varied – see above 85 L/min Varied – see above Varied – see above 40 L/min
Exhalation resistance - max pressure drop ≤ 245 Pa ≤ 300 Pa ≤ 250 Pa ≤ 120 Pa ≤ 300 Pa ≤ 70 Pa (w/valve) ≤ 50 Pa (no valve)
Flow rate 85 L/min 160 L/min 85 L/min 85 L/min 160 L/min 40 L/min
Exhalation valve leakage requirement Leak rate ≤ 30 mL/min N/A Depressurization to 0 Pa ≥ 20 s Leak rate ≤ 30 mL/min Visual inspection after 300 L/min for 30 s Depressurization to 0 Pa ≥ 15 s
Force applied − 245 Pa N/A − 1180 Pa − 250 Pa N/A − 1470 Pa
CO2 clearance requirement N/A ≤ 1% ≤ 1% ≤ 1% ≤ 1% ≤ 1%