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MERV, MPR and FPR Rating Systems
What Is the Difference Between MERV Rating, MPR and FPR?
Why 3 different rating systems?The three rating systems were created by different organizations. MERV is the domestic and international Industry Standard rating system established by the American Society of Heating, Refrigerating, and Air Conditioning Engineers. The other two rating systems were created by "3M" and "The Home Depot", but at the end of the day they are rating the SAME filter!
MERV Rating (Minimum Efficiency Reporting Value):As you have already learned, the MERV Rating is the primary rating system used in the industry, both domestically and internationally. Established by the American Society of Heating, Refrigerating, and Air Conditioning Engineers, MERV rates a filter’s ability to capture and hold particles and pollutants.
MPR (Micro-Particle Performance Rating):MPR Rating is a rating system developed by 3M. It rates the manufacturer’s filters and their ability to capture airborne particles smaller than 1 micron.
FPR (Filter Performance Rating):FPR Rating is a rating system developed by The Home Depot for brands sold through their stores, including Honeywell. It utilizes a color code and number scale (4 to 10) that closely resembles the MERV rating.
Compare MERV, MPR, and FPR with the chart below.
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