Understanding the Difference Between MERV and FPR Ratings

When it comes to air filtration, it can be difficult to choose between a MERV classification and an FPR classification. Both are useful, but the FPR may be easier to understand, since it uses a more intuitive numerical system. FPR scores are filtered from one to ten, with ten being the best. MERV stands for Minimum Efficiency Reporting Value, and the MERV classification is the main classification system used for air filtration.


filters typically filter 90% of particulates from the air, MERV 11 can remove around 95%, and MERV 13 can block approximately 98%.

That's because there are different standards to meet, so you'll see some air filters with the MERV rating, while others are rated MPR or FPR. The FPR system takes into account the pressure drop and dust-holding capacity of air filters, aspects that MERV and MPR systems do not address. A higher MERV rating may mean slightly more restricted airflow; however, most current HVAC systems are capable of handling a MERV 11 air filter without overloading the system. In these cases, a MERV 11 air filter can provide additional benefits and capture a wider range of particles that would pass through a MERV 8 filter. The main drawback of using filters with an FPR rating of 8 to 9 is that they will reduce airflow more than filters with a lower FPR rating. In addition, filters with an RPF rating of 4 to 5 will not restrict airflow as much as filters with a higher RPF rating.

Newer units shouldn't have airflow problems with higher MERV ratings, although older models can work harder with a MERV 13 filter installed than when they originally had a MERV 6 filter in the air intake. In terms of efficacy, it is difficult to choose between a MERV classification and an FPR classification. Filterbuy offers MERV 8, MERV 11, and MERV 13 air filters and ovens, which cover the normal range of household needs by providing clean air and, at the same time, protecting air conditioning equipment. I'll also explain how the FPR system rates an air filter and discuss what the best FPR rating is for use in your home. In my opinion, the FPR system is a more complete classification system for air filters compared to the MERV and MPR systems. MERV 11 equals an FPR of 7.MERV 12 equals the MPR of 1900 and an FPR of 8 or 9.


filters are equivalent to an FPR rating of 10. However, if the MERV rating is too high (above MERV 1), it can increase system backpressure and block air flow through the central air system, worsening the efficiency of the air conditioning system. Fortunately, you won't have to make a long list of advantages and disadvantages between the MERV and the MPR or spend hours comparing the FPR to the MERV.

MERV 13 air filters provide even greater filtering power against fine particles compared to MERV 11 filters. When selecting an air filter for your home or business, it's important to consider both MERV ratings and FPR ratings. The higher the MERV rating, the better protection you'll get from airborne particles like dust mites, pollen, mold spores, pet dander, smoke particles, bacteria, viruses, and other allergens. The higher FPR ratings indicate better dust-holding capacity and pressure drop performance. Ultimately, you should choose an air filter that meets your needs while also protecting your HVAC system from damage. At Filterbuy we offer a wide selection of high-quality air filters in both MERV and FPR ratings so you can find one that fits your needs perfectly.

Our team is always available to answer any questions you may have about selecting an air filter for your home or business.

Darryl Coste
Darryl Coste

Friendly web scholar. Devoted student. Wannabe pizza fanatic. Subtly charming bacon fan. General entrepreneur. Infuriatingly humble troublemaker.

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