NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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How efficient are HEPA filters at removing particles of 0.3 microns or larger?

  1. >85%

  2. >95%

  3. >99.97%

  4. >90%

The correct answer is: >99.97%

HEPA (High Efficiency Particulate Air) filters are highly effective at removing small particles, including those that are 0.3 microns or larger. Unlike regular filters, which may only capture some particles, HEPA filters are able to trap 99.97% of particles that are 0.3 microns or larger. This means that these filters are much more efficient than the other options listed, which have lower percentages or do not specify the size of particles they are able to remove.

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