MERV vs. MPR vs. FPR Rating Systems

air filter ratings explained

  • Learn the differences between MERV, MPR & FPR to choose the best filter for your needs.

  • WHAT IS THE DIFFERENCE BETWEEN MERV, MPR, AND FPR AIR FILTER RATINGS?

    The three air filter rating systems differ in ranges and were created by separate organizations. MERV ratings extend from 1 to 16. MPR measures ratings based on sizes 0.3 to 1 microns. FPR ratings are on a scale from 4 through 10. The MERV filter rating is the domestic and international industry standard rating system established by the American Society of Heating, Refrigerating, and Air Conditioning Engineers. The other two systems were created by "3M" (MPR) and "The Home Depot" (FPR) to differentiate their offerings. However, at the end of the day, the ratings apply to the SAME filters and can be used in your furnace or AC unit!

  • WHAT IS MERV FILTER 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. Smaller particles can be trapped and removed by higher MERV ratings.

    At Air Filters Delivered, we label our air filters by their MERV filter rating. You may choose from four different options:

    To better understand what sets the four ratings apart, take a look at our MERV rating chart!

  • WHAT IS MPR (MICRO-PARTICLE PERFORMANCE RATING)?

    MPR, or 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. While MERV ratings reflect a filter's ability to trap both microscopic and macroscopic particles, MPR ratings only grade a filter on its capacity to remove particles from 0.3 to 1 microns. For reference, a typical dust particle is between .2 and 8 microns, while pollen starts at 7 microns and can get up to 70 microns in size.

  • WHAT IS FPR (FILTER PERFORMANCE RATING)?

    FPR, or filter performance rating, labels filters based on a number scale from 4 through 10 in addition to a color-coding system. Designed by The Home Depot for brands sold through their stores, including Honeywell, this rating structure is very similar to MERV rating.

    Learn more about proper air filter maintenance and associated benefits.

  • MERV Rating Chart

    MERV, MPR and FPR Rating Systems
  • Advantages of Frequently Changing Air Filters

    FPR, MERV, MPR – it doesn't matter! In order to keep your air clean in your home or business, it is important to install replacements frequently.

    At Home

    • Captures indoor air pollutants
    • Reduces your energy bill
    • Lowers air-related allergy/asthma indoor triggers
    • Diminishes the growth of mold and mildew

    At Work

    • Reduced exposure to airborne allergens, toxins, and irritants
    • Better concentration
    • Improved sanitary conditions by OSHA standards
    • Chemical / biological contamination is controlled