Review on Protection Polypropylene Nanofiber Efficiency Breathable by Hassan Tomlinson
Filter does not let air through
This filter is useless as it does not let air through. If you put it in a mask as suggested, you'll either suffocate when the rest of your mask is sealed, or, like most masks, the air doesn't flow from the sides of your mask and not through the filter. The force required to blow air through this thing is significant.
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