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

Correct Test Weight Handling Guide: 12 Practical Tips

Essential Laboratory Skills Guide

What is the Sensitivity of my Balance?

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.