According to the WHO Interim Guidelines on the Prevention and Control of Infectious Epidemic and Pandemic Acute Respiratory Diseases in Health Care:
1. Carefully cover the mouth and nose with a mask and fasten it to minimize the gap between the face and the mask;
2. Avoid touching the mask when using it-after touching the used mask, for example, when removing the mask, wash your hands with soapy water or alcohol hand sanitizer;
3. After the mask is wet or contaminated with moisture, replace with a new clean and dry mask;
4. Do not reuse disposable masks. Disposable masks should be discarded after each use and disposed of immediately after removal.
The following are the specific steps.
The first step is to distinguish between positive and negative
The mask is divided into front and back, top and bottom, the front is darker, and the back is lighter. The red circle is the top, and there are metal strips for nose clips.
The second step, washing hands
Wash your hands before wearing a mask, because the mask is relatively sterile. If the hand is dirty, touch the mask. The dirt on the hand will rub on the mask, and the mask will be worn in vain.
The third step is to put on
Make sure that the face of the mask is facing inwards, the end with the metal strips facing up, and hang the ropes at both ends on your ears.
The fourth step, compression and stretching
Use both hands to press the metal strips on both sides of the nose bridge tightly so that the upper end of the mask is close to the nose bridge, and then stretch the mask down so that the mask does not leave wrinkles and better cover the nose and mouth.
The correct wearing method can prevent the gas from entering and exiting from both sides of the bridge of the nose, thereby exerting the filtering and ventilation functions of the mask, protecting yourself and protecting others.
How often do masks need to be replaced?
It should be emphasized that no matter what type of mask, the protective effect is limited and needs to be replaced regularly. It is best to replace it every 2 to 4 hours.
If it is used for a long time, large particles will be blocked on the surface of the mask or ultra-fine particles will block the gaps in the filter material of the mask, which will cause a decrease in filtration efficiency and an increase in respiratory resistance.