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1 kwi 2020 · a. Modifications were made to the MERV table to adjust the threshold for specific MERVs and allow for the 16 gradu-ations to be more observable in testing. b. To address user concerns about reproducibility and reli-ability of the test method, ASHRAE commissioned Research Project RP-1088, a comprehensive round robin of multiple
MERV values in the 52.2 test reporting. Note: This table is intended to be a general guide to filter use and does not address specific applications or individual filter performance in a given application.
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.
We’ll look at MERV 1-20 ratings in the MERV rating chart (you’ll find the chart further on). We’ll also look into how high a MERV rating an air purifier should have to best filter out different air contaminants (pollen, mold spored, smoke, dust, etc.).
MERV Defined. To address the issue of particle size, ASHRAE 52.2 was issued in 1999 and modified in 2007 to complement, not replace, Standard 52.1, by enabling engineers/designers to select a filter based upon the actual known particle size of the contaminant desired to filter.
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 ex-tensive data generated by the method of testing. MERV is expressed on a 16 point scale and is de-rived from the PSE for each of the three groups. (See Table 3: MERV Parameters.)
The standard filter selection for office buildings is a MERV 13, which has an efficiency of 31% at 0.3 micron particle size. Both of these filters have excellent sub-micron particle capture efficiency.
