Face masks with exhaust vents protect the wearer against infections, because particles cannot get in through the valve. However, they do not protect others from being infected, as the valve allows unfiltered air to be released when the wearer exhales. This means the wearer can still spread the virus while wearing a mask.
Social distancing recommendations inform people to stay 6 feet apart from one another. But scientists are discovering that this may not be sufficient. This shows why it is so essential to wear a face mask when you are out in public settings.