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Why you should use protective mask in public

w3 layers mask

Standards for MASK

Class[5] Filter penetration limit (at 95 L/min air flow) Inward leakage Typical elastic band
FFP1 Filters at least 80% of airborne particles <22% Yellow
FFP2 Filters at least 94% of airborne particles <8% Blue or White
FFP3 Filters at least 99% of airborne particles <2% Red

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