The KN95 mask is a mask with a breathing valve. wholesale kn95 face mask.The role of the breathing valve is to use a mask with a breathing valve to help you feel more comfortable when exhaling in hot, humid or poorly ventilated or labor-intensive work environments.

Use time: It depends on the personal use and environment, but it should be replaced immediately when it is found that breathing is difficult or uncomfortable, the mask is contaminated with foreign objects such as blood stains or droplets, the user feels that the breathing resistance has increased, and the mask is damaged.

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