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MERV Rating - Actual Particle Size Removed and Efficiency in Percentage
  • MERV Rating
    0.3 – 1.0 Microns*
    1.0 – 3.0 Microns
    3.0 – 10.0 Microns

  • 1 -- -- <20%
  • 2 -- -- <20%
  • 3 -- -- <20%
  • 4 -- -- <20%
  • 5 -- -- 20-35%
  • 6 -- -- 35-50%
  • 7 -- -- 50-70%
  • 8 -- -- >70%
  • 9 -- <50% >85%
  • 10 -- 50-65% >85%
  • 11 -- 65-80% >85%
  • 12 -- <80% >90%
  • 13 <75% <90% >90%
  • 14 75-85% <90% >90%
  • 15 85-95% <90% >90%
  • 16 <95% <95% >95%

*A human hair is roughly 20-40 microns in size, while viruses (the smallest airborne microbes) range in size from .01 to 0.3 micron.