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Here is the full MERV rating chart: The most prevalent MERV ratings are MERV 4, 6, 8, 10, 12, 14, and 16: MERV Rating In Air Purifier Specification Sheets (Or Lack There Of) A Higher MERV rating automatically means a better filter. You can see from the MERV scale above that MERV 10 filter will filter out 85% of 3.0-10.0 μm particles.
What is a MERV rating? Minimum Efficiency Reporting Values, or MERVs , report a filter's ability to capture larger particles between 0.3 and 10 microns (µm). This value is helpful in comparing the performance of different filters
The MERV rating chart is a numerical chart with values from one through 20. The highest MERV ranking means that an air filter will capture the most amount of dust, while the lowest rating means a filter will catch the least amount of dust.
An air filter’s minimum efficiency reporting value (MERV) rating measures how effectively the filter stops dust and other contaminants from passing through the filter and into the air stream.
A MERV rating chart shows a numerical value. The range is from 1 (lowest efficiency) to 20 (highest efficiency). MERV stands for Minimum Efficiency Reporting Value. This is an industry standard rating system. Use this rating system compare filters made by different manufacturers.
Minimum Efficiency Reporting Value, commonly known as MERV, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to report the effectiveness of air filters in more detail than other ratings.
MERV RATING CHART Standard 52.5 Minimum Efficiency Reporting Value Dust Spot Efficiency Arrestance Typical Controlled Contaminant Typical Applications and Limitations Typical Air Filter/Cleaner Type 20 n/a n/a < 0.30 pm particle size Cleanrooms >99.999% eff. On .10-.20 pm Particles 19 n/a n/a Virus (unattached) Radioactive Materials > 99.999% ...