BYD masks are a Chinese brand.

BYD masks are three-layer masks with a production date of February 23, 2020 and a use period of 1 year. They are produced by BYD Precision Manufacturing Co., Ltd. and can be used in medical and health care, dust-free workshops, catering services, etc. It is composed of two layers of non-woven fabric + a middle layer of non-woven fabric filter layer. The middle layer has anti-bacterial effect and is made of ultrasonic welding.

BYD masks

The regular size of the mask is 17.5x9.5, with an error of 0.5. The light color faces inward and the dark color faces outward. If it is difficult to distinguish the color, you can look at the ear straps. The side to be installed is the inner side. The aluminum-plastic nose clip points upward, and the earband hangs on the ear when wearing it.

The new coronavirus is mainly spread through droplets, with droplet sizes between 0.1 and 0.3 microns. Usually the transmission medium is particles with a droplet diameter greater than 5 microns (but PM2.5 masks are not fully effective Filter droplets, and the material structure and function of each layer are different).

Therefore, it is recommended that everyone wear disposable medical masks and N95 level masks. When wearing them, try to keep the masks close to the face. When adjusting the position, try not to touch the mouth and nose loops of the mask with your hands. Once the mask gets wet, you must Replacement, the standard of changing masks every 4 hours is based on this.

Because N95 masks have high airflow impedance and can cause breathing difficulties, the average person should avoid wearing them for long periods of time. It is also not suitable for people with poor lung function, pregnant women, or people with chronic respiratory diseases or asthma. It's better to avoid going out altogether.