Filtering face mask that has a new exhalation valve

摘要: A filtering face mask that comprises a body is adapted to fit over the nose and mouth of wearer, comprising filtration layer through which inhaled air may pass before being by wearer mask; an exhalation valve attached body, allowing exhaled from interior its exterior without having layer, comprising: seat comprises: seal surface; orifice circumscribed single flexible flap has one fixed portion free circumferential edge, edge first segment associated with so as remain at rest during second be lifted away surface exhalation, also located below when worn on person, mounted such pressed towards in abutting relationship it fluid not passing orifice.