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What is the protective effect of kn95 / N95 respirator with breathing valve?
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kn95 / N95 masks also have breathing valve and no breathing valve. For respirators,výsledky priepustnosti vzduchu a účinnosti filtrácie sú vždy dvojicou protirečení. Ak je efekt filtrácie dobrý,často sa budete cítiť udusení. Dýchací ventil je určený na zmiernenie zadusenia.
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The exhalation valve and the inspiratory valve are mechanical switches. They close when inhaled and open when exhaled. The air passes through the filter & quot;screen & quot; once. When exhaled, the valve opens to reduce the sense of resistance. The problem is that people don & #39;t know if the mechanical switch will break down suddenly when they wear it,alebo ak sa zachytia malými časticami, so that the air carriers who don & #39;t pass through the filter layer can take advantage of harmful particles. Therefore,lekárske masky nemajú dýchací ventil. V rovnaký čas, we also call on the general public to choose kn95 / N95 mask or medical surgical mask without breathing valve as much as possible during the anti epidemic period,najmä ak je okolité prostredie relatívne chudobné.
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