Takashi Saito
All current surgical masks designed for metabolism protection of each medical personal and public square measure engineered on the filtering mechanism. Filtering is essentially inconvenient: it prohibits free breath, creates dampish space close to face, and therefore the filter performance deteriorates quickly. Within the in the meantime, most medical applications, from surgery and general practitioner to subject protection within the areas of individuals concentration, don't need filtering.
English 
Spanish 
Chinese 
Russian 
German 
French 
Japanese 
Portuguese 
Hindi