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The following are extracted from the network, for reference only
1. Is the traditional gauze mask useful?
Useless. After the "SARS" campaign, Jin Xiangyu's team conducted
special experiments in the laboratory environment, using 12 or even
18 layers of gauze masks. As a result, the particulate matter
filtering rate was only 96%, which was almost the same as the 95%
filtering rate of the single layer of standardized disposable
masks. "Besides, in reality, it is impossible to wear more than ten
layers of gauze masks repeatedly."
2. Does the anti haze mask work?
useless. The design standard of anti haze masks is different from
that of medical masks, and they are not used to intercept viruses.
If the built-in filter material is exposed to viruses, it cannot be
properly disposed and is easy to be polluted again. In addition,
anti haze masks often have decorative and thermal design. It is not
recommended to use haze masks in the epidemic situation.
3. Is it useful to wear a valve mask?
It is also not recommended. The mask with valve function is mainly
used for dust prevention. Jin Xiangyu told the reporter that the
valve is a "breathing valve" after leaving the dusty environment,
which can breathe smoothly when opened. However, this valve has the
risk of failure, and it cannot prevent the virus from being inhaled
when large particles get stuck.
4. Is it more useful to wear two disposable masks?
It's no use. Some people wear two disposable masks because they are
afraid of being thin, which Jin Xiangyu said was unnecessary.
Because they have also done experiments to confirm that the
"interception rate" of overlapping disposable masks to viruses is
also 95%. In addition, the double-layer respirator greatly
increases the respiratory resistance, resulting in "stuffy"
discomfort.