MERV vs. MPR rating

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Minimum Efficiency Reporting Value, or MERV for short, is a filter rating system devised by ASHRAE, the American Society of Heating, Refrigeration and Air Conditioning Engineers, to standardize and simplify air filter efficiency ratings for the public. The higher the MERV rating, the higher the effectiveness of the air filter

Microparticle  Performance Rating, or MPR for short, is a filter rating system developed by 3M to rate a filters ability to cature the smallest airborne particles. The higher the MPR rating the better the filters ability to capture particles from the air. This system helps in comparing 3M filters, but is not directly comparable to the MERV rating system.

If your filter at home is rated by the MPR system, here is a table to show you what the comparable MERV rating would be.

MPR rating       Comparable MERV rating

300....................6
600....................8
1000..................11
1200..................11
1500..................12
1900..................12
2200..................12

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