All of our filters at filter-guru.com undergo ASHRAE Standard 52.2 testing, but what does that mean?
"An air filter’s performance is determined by measuring the particle counts upstream and downstream of the air-cleaning device being tested. Particle counts are taken over the range of particle sizes six times, beginning with a clean filter and then after the addition of standard synthetic ASHRAE dust loadings for five additional measurement cycles."
Okay, but is that the MERV rating?
"An "overall" reporting value of a 52.2-evaluated air filter is the expression of the Minimum Efficiency Reporting Value (MERV). The MERV is a single number that is used, along with the air velocity at which the test was performed, to simplify the extensive data generated by the method of testing. MERV is expressed on a 16 point scale and is derived from the PSE for each of the three groups."
So, that's how you get a MERV rating?
Merv 8 has a 30-35% Dust Spot Efficiency, an Arrestance of >90% and a typical Controlled Contaminant of 3.0-10.0 pm Particle Size.
Merv 11 has a 60-65% Dust Spot Efficiency, an Arrestance of >95% and a typical Controlled Contaminant of 1.0-3.0 pm Particle Size.
Want to know more? There are a whole lot of numbers and charts here.
Want a more fun way of testing filters. Well, check this out:
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