Minimum Efficiency Reporting Value

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.

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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. Higher MERV ratings correspond to a greater percentage of particles captured on each pass.^[1]

References

M.N.Rama Rao & Company. Industrial Filters (Eurovent and ASHRAE Classifications). Retrieved on 2007-09-19.
Wilkinson, Ron. Air Filters: New Facilities, New Standard. Retrieved on 2007-03-29.