How long can the KN95 mask be used ？

Masks should be replaced in time when the following conditions occur:

1. When respiratory impedance is significantly increased;

2. If the mask is damaged or damaged;

3. When the mask cannot fit closely with the face;

4. The mask is contaminated (e.g. stained with blood or droplets);

5. Used in individual wards or patients (because the mask has been contaminated).

Foreign countries, including WHO, have not made a clear conclusion on the best time to wear N95 masks, and China has not made relevant regulations on the time to use masks.

Precautions for wearing KN95 mask

1. Wash your hands before wearing a mask, or avoid touching the inside and side of the mask to reduce the possibility of contamination.

2. Distinguish the inside and outside of the mask, top and bottom; KN95 mask has a printed side for the outside; The metal strip/sponge strip ends at the top of the mask.

3. Do not use hands to squeeze masks, including N95 masks, which can only isolate the virus on the surface of the mask. If you squeeze the mask with hands, the virus will wet the mask with droplets, and there is still a chance of infection.

4. Make sure that the mask fits well with the face as far as possible. A simple test: After putting on the mask, exhale hard enough that air does not escape the edges of the mask.