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KN90 for at least 90 percent filtration efficiency against certain non-oil-based particles and aerosolscan effectively filter dust particles and viruses is a medical-grade protective mask [FLOW VALVE] helps reduce heat build-up inside the respirator breathe easier is defined as initial pressure dropsecure seal with fewer pressure points
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With five filtration layers this face mask claims to filter 95% of airborne particles including a high-density meltblown fabric filter material. The mask is made with skin-friendly materials and .
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