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Wearing masks in public has become a crucial part of protection for COVID-19. Some states and major cities have made mask-wearing a requirement. “Masks” can mean handkerchiefs, specially designed cotton masks, or disposable masks (such as N95 respirators) as long as they cover your nose and mouth. However, some locations have banned masks with valves. What is a Mask Valve? Some masks or respirators will have a piece of plastic embedded in the fabric. This plastic is a one-way valve …