[–] [deleted] ago 

[Deleted]

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[–] 22770329? [S] ago 

Those masks need to be individually fitted for the user. If you just buy one off of the shelf you probably won’t get the correct fit. If you have facial hair.. ineffective. Don’t know how to use it... no good. When they fit nurses for their masks they put them in a hood and shoot aerosol droplets in to check fit. The average person wouldn’t know how to wear and store their masks. Lots of factors that can make them ineffective