There are different types of masks to protect the body, including surgical or cloth masks, N95 mask, N99 mask ... with an intact seal and an expiratory valve to breathe out carbon dioxide ...

N95 & KN95 Masks Jubanyik recommends KN95 and N95 masks ... “In addition, do not wear a mask with a valve or an exhalation ...

To remedy the N95-standard face mask shortage at Japan hospitals caused by the COVID-19 pandemic, a medical institution and three companies in the Kansai region have teamed to develop and produce ...