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MERV, or Minimum-Efficiency Reporting Value, is a measure of the efficiency with which filters remove particles of specific sizes. According to the Standard 52.2 application guidelines, particles in this size range include pollen, dust mites, mold spores, hair spray, powdered milk, and, of course, snuff. Higher MERV ratings (from 13 to 16) are needed to remove bacteria and smoke particles. At the…