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hippyjoe1955 · 70-79, M
As a graduate of several masking courses in order to access various industrial sites the 'medical mask' is the joke mask of the entire mask menu. A good industrial mask is engineered to keep out dangerous particles and allow the free exhaust of exhaled breath. Keeping tiny particles out but not allowing the exhaled breath to escape is a disaster waiting to happen since your brain function is decreased due to high levels of CO2 in the air being inhaled. Then there is the small matter of the medical mask not sealing thus not doing a full filtering job. If I were to go to an asbestos removal site I would not go wearing a medical mask thinking that it would protect me from the danger of asbestos. A virus is a much smaller particle that asbestos particulate and thus the medical mask is completely incapable of stopping the transmission of viral infection.