2. Cloth mask protects others from being infected, but many 3-ply ones do not have the good quality centre filter.
3. Many non-medical N95 respirators have exhalation valves to make the wear feel less stuffy as they let out unfiltered air from the wearer. This means that the asymptomatic Covid-19 wearer can still transmit the respiratory droplets to infect other. They should not be worn around other people esp. at close quarters unless the valve is covered over with tape or cloth.
They were selling at around $6.90 per respirator in Mar 2020, but much depends on the quality as some sell as cheap as $2.00.
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