European standard EN 149 defines:
Class Filter penetration limit (at 95 L/min air flow) Inward leakage
FFP1 Filters at least 80% of airborne particles <22%
FFP2 Filters at least 94% of airborne particles <8%
FFP3 Filters at least 99% of airborne particles <2%
These respirators are entirely or substantially constructed of filtering material.
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