N1 Respirator
From Gomerpedia
3M's N1 respirator is a particulate-filtering respirator that was a huge commercial bust, the major reason being that it only filtered 1% of airborne particles, essentially make it no better than having a patient with TB directly sneezing into your open mouth. Repeatedly. After over 90 attempts, 3M finally improved upon the N1 respirator to create the much more effective as well as stylish N95 respirator.
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