A cleanroom face mask or facial covering must be capable of efficiently filtering particles that range from 0.1 microns to over 20 microns in order to significantly control particles produced by the human respiratory system of a cleanroom worker. In addition to particle filtration efficiency, there are several other important face mask performance criteria that impact the overall effectiveness of a cleanroom mask. This article reviews the evolution of the cleanroom face mask and the test methods for measuring filtration efficiency. Performance criteria and test methods for measuring cleanroom face mask performance are recommended.

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