Filtering Facepiece Respirators with an Exhalation Valve
Masks and respiratory protective devices may protect the wearer to varying degrees from exposure to potentially infectious droplets, and these devices have varying degrees of protection. These devices can be classified into three categories: (1) respirators (e.g., those that are NIOSH-approved respirators or authorized for emergency use); (2) masks intended for medical purposes (e.g., FDA-cleared surgical masks including those labeled as procedure masks); and (3)masks intended for a non-medical purpose.
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