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HVAC systems: What is an MPR vs. MERV rating?

At 3M we believe MERV only tells part of the story when it comes to your furnace or air conditioner filter.

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Microparticles matter most — they make up 99% of what we breathe in.

The smaller the microparticle, the more difficult it is to capture and the longer it stays in the air (or our lungs).

  • MPR

    Microparticle Performance Rating (MPR) — superior to MERV

    Scientists at 3M believe that MERV only tells part of the story. It’s why we created a different measurement — Microparticle Performance Rating (MPR). This rating includes microscopic particles not visible to the naked eye. Microparticles are not even measured on the MERV scale until it reaches MERV 11.


    Exclusive Filtrete™ Brand filter technology focuses on capturing the tiniest particles – between 0.3 and 1 micron (µm) in size. Our Healthy Living filters capture bacteria, cough and sneeze particles, and even viruses.

  • MERV

    Minimum Efficiency Reporting Value (MERV)

    Minimum Efficiency Reporting Value (MERV) is the industry standard for measuring how well a heating and cooling system’s filter captures particles. Many people just want to know “what MERV number do I need to buy?” MERV air filter ratings range from 1 (least efficient captureability) to 16 (very efficient).


    Many homes use filters with a MERV rating of 1-4 which mostly filter out dust, lint and pollen among other larger, common particles — they do very little to trap small microparticles.

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MPR vs MERV Compairison

MPR vs. MERV Comparison

Compare Filtrete™ Brand MPR Filters to MERV Filters

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  • Air Flow

    Filtrete™ Brand Filters with MPR

    Many other rating systems like MERV (which was created by a 3rd party) do not consider the air resistance created by a filter. High air resistance makes your home’s heating and cooling less efficient, and can waste energy and may even damage your system.

    Filtrete™ Brand Filters are designed to deliver premium air filtration with low lifetime airflow resistance — this makes it ideal for your heating and cooling system.

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  • Home Measurement

    Make sure your air filter is measured by MPR

    The higher the MPR, the more microparticles your filter will capture as you run your heating or cooling system. From remodeling a home to adopting a new pet, each home has its unique filtration requirements. We can help you find the filter right for your home.

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  • Particle Size

    Understanding particle sizes

    Filtrete™ Brand technology makes it possible to capture the tiniest particles – between 0.3 and 1 micron in size — including bacteria and viruses through select high-performing filters within the portfolio.

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