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.

Additional recommended knowledge

Daily Sensitivity Test

What is the Sensitivity of my Balance?

How to ensure accurate weighing results every day?

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.