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N95 mask suitability test

In addition to the filtration efficiency of the N95 mask, the closeness between the mask and the face is one of the important factors that determine the effectiveness of the mask.Therefore, before using the mask, the suitability of the mask should be tested first.When testing the tightness of the wearer's face, make sure that air can pass through the mask under the condition that the mask is close to the edge of the face.

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