This KN95 respirator comes with an exhalation valve which provides the same level of protection to the wearer as one that does not have a valve. The presence of an exhalation valve reduces exhalation resistance, which makes it easier to breathe (exhale). A respirator with an exhalation valve keeps the face cooler and reduces moisture build-up inside the facepiece. However, respirators with exhalation valves should not be used in situations where a sterile field must be maintained because the exhalation valve allows unfiltered exhaled air to escape into the sterile field or open environment. These respirators are CE and FDA certified.
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