Minimum Efficiency Reporting Value, commonly known as MERV Rating is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to rate the effectiveness of air filters.
The scale is designed to represent the worst case performance of a filter when dealing with particles in the range of 0.3 to 10 micrometres. The MERV rating is from 1 to 16. Higher MERV ratings correspond to a greater percentage of particles captured on each pass, with a MERV 16 filter capturing more than 95% of particles over the full range.
References
- M.N.Rama Rao & Company. "Industrial Filters (Eurovent and ASHRAE Classifications)". http://www.mnrfilters.com/automotive.html. Retrieved on 2007-09-19.
- Wilkinson, Ron. "Air Filters: New Facilities, New Standard". http://www.foustco.com/_fileCabinet/ProductInstructions/HVACFilters/merv_explanation.pdf. Retrieved on 2007-03-29.
- Newell, Donald (February 2006). "Interpreting Filter Performance: The meaning behind the terminology of ASHRAE standards 52.1 and 52.2". HPAC Engineering. http://www.emcorservicesnynj.com/news/FilterPerformanceByDN.pdf. Retrieved on 2009-05-11.
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