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MERV and MPR Ratings – What Do They Mean?

When choosing an air filter, it is important to understand the terms MERV rating and MPR rating in order to select the best filter for your needs. MERV stands for Minimum Efficiency Reporting Value, and it is a measure of how efficient a filter is at removing particles of varying sizes from the air. MPR stands for Microparticle Performance Rating, and it is a measure of a filter’s ability to capture smaller particles, such as dust, pollen, mold spores, and pet dander.

MERV & MPR Ratings

MERV Ratings

A MERV rating is based on a system developed by the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE). The MERV rating system is used to grade air filters on a scale of 1 to 16. A low-efficiency filter will have a MERV rating of 1 to 4, while a high-efficiency filter will have a rating of 15 or 16. The higher the MERV rating, the more effective the filter is at trapping particles. Filters with high MERV ratings are sometimes referred to as “hospital grade” because they are used in medical settings and other places where air quality must be extremely clean.

MPR Ratings

MPR ratings measure the efficiency of a filter in capturing particles that are 0.3 microns in diameter or smaller. These are referred to as "microparticles." Filters with higher MPR ratings are better at capturing these tiny particles from the air, making them a better choice for people with allergies or asthma. MPR ratings range from 100 to 1400, with the higher numbers indicating superior filtration.

Consider Both MERV & MPR

When selecting an air filter, it is important to consider both the MERV and MPR ratings in order to make the best choice for your needs. The higher the MERV and MPR ratings, the more effective the filter will be at capturing larger and smaller particles from the air, making the air healthier and more comfortable.