what does percent of penetration mean ?

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What does percent of penetration mean ?

It is the amount of challenge aerosol, detected on the downstream side of a filter by a linear photometer, measured against the concentration of challenge aerosol on the upstream side of the filter. with a base of 100% for the upstream concentration, and a reading of 0.01% penetration on the downstream side, the indication is that the filter is 99.99% efficient with respect to that particular concentration.