Example of how the purpose of masks for ordinary people is still not understood. The ones with exhalation valves, including N95s, should not be worn around people, period. Not just in sterile hospital operating rooms as NYT claims. Cotton mask>valved N95.https://www.nytimes.com/interactive/2020/health/coronavirus-best-face-masks.html …
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Why would you want to cover the valve? You do know it’s a one-way valve, open during exhalation only.
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To make sure you're not transmitting outwards especially while asymptomatic. I've seen a whole range of valve designs, and some would block nothing and there is still a bunch of questions on droplet size etc. Nature paper: most infectious two days prior plus day of of symptoms.
End of conversation
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