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We've been gathering industry reports and scientific research around the effectiveness of different types of personal filtration equipment, and we hope this list helps inform you a bit better. 3M published an informative PDF describing the different types of filtering facepiece respirators. As a large producer of N95 masks, they have an obvious incentive to promote their products, but this PDF is still helpful in describing the differences between global standards for rating PPE. Smart Air Filters blog has an informative post comparing homemade masks to manufactured ones (such as KN95s). They show that while a homemade mask is better than no mask at all, they...

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A commonly asked question. The attached table demonstrates how the two respirators have nearly identical testing standards.  One standard is American (NIOSH) the other is Chinese (GBP) Breaking down the table: Filter performance refers to the reduction in concentration various aerosols in the air that pass through the filter Test Agent refers to the aerosol that is used for the test, in this case, Salt Water (NaCl) Total inward leakage is the amount of aerosol that enters the facepiece after 3 minutes in a test chamber. Pressure Drop is the resistance air is subjected to as it moves through the respirator filter.

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