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What is the meaning of MPR, FPR and MERV?

August 17, 2021

You may have seen different metrics or systems used to rate home air filters. But what do they mean for the air in your home? MPR, FPR and MERV are all rating systems used to explain their particle-catching abilities.

What is MPR?

MPR stands for Microparticle Performance Rating. It was created by 3M and used to rank their filters’ ability to catch small airborne particles. The MPR system is only helpful when comparing one 3M Filtrete filter to another one. It does not directly translate into a MERV rating. If you’re currently using a 3M filter using the MPR system, it will be hard to translate into a MERV rating as the two do not directly correlate.

What is FPR?

Filter Performance Rating or FPR for short was developed by The Home Depot. They created this system based on independent lab test results comparing them to MERV ratings. The FPR system is used strictly in Home Depot stores and does not directly correlate to MERV ratings.

What is MERV?

A MERV Rating tells consumers how effectively a filter can catch contaminants such as dust, pollen, and pet dander. MERV ratings were established by the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE). This was done to help consumers understand what type of filter best fit their needs.

FilterTime uses the standard MERV Rating system to make it easier to select the filter best for your home. If you visit the website, the “Our Filters” page explains more about the home air filter options we offer.

For Comparison

This chart represents approximate values of MPR and FPR filters to the MERV rating used by FilterTime and the Allergen, Allergen Preferred and Allergen Supreme options.






MPR 600*

FPR 5*

Allergen Preferred


MPR 1000*

FPR 7*

Allergen Supreme


MPR 1500 – 1900*

FPR 10*

*Approximate values

To learn more about these filters, visit: or reach out to the FilterTime team - questions are always welcome.

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