MERV Rating vs MPR vs FPR

Navigating through Rating Systems

Choosing the right air filter can be a daunting task. Have you wondered why there are 3 different rating systems? Certain brands have created their own rating system but at the end of the day, they are rating the SAME filter! Unaware consumers often find themselves paying premium prices at grocery stores or big box retailers. Learn the facts and your next purchase will be much easier on your wallet.

MERV Rating (Minimum Efficiency Reporting Value) 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) 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) is a rating system developed by The Home Depot for brands sold through their stores, including Honeywell. It utilizes a color and number scale from 4 to 10 that closely resembles MERV rating.

This chart will help you understand how the ratings are comparable to each other:

MERVMPRFPREfficiencyChange Frequency
86005/GreenDust, pollen, dust mites, lint90 Days
1110007/RedMERV 8 + mold spores, bacteria, smoke, pet dander90 Days
13190010/BlueMERV 11 + virus carriers and odors90 Days