MERV (Minimum Efficiency Reporting Value) is the industry-standard ratings system used to measure the effectiveness of air conditioner filters. Ratings for residential and commercial AC filters typically fall between MERV 5 and MERV 12. Filters with higher MERV ratings remove more small particles from your air than lower-rated filters.
The MERV system was developed in 1987 by the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE), the international trade group that represents HVAC professionals.
What MERV Rating is Right for Me?
Why Not Go Higher?
Filters with very high MERV ratings (MERV 13+) are designed for specialized commercial uses (hospitals, clean rooms, etc.). These filters restrict air flow so much that they use substantially more electricity and can damage your air conditioner or furnace unit.
What About FPR and MPR Ratings?
FPR and MPR are proprietary ratings systems developed by home improvement stores and filter manufacturers. They are not directly relatable to MERV (an FPR 4 filter cannot be compared to a MERV 4 filter). These ratings systems are not endorsed or backed by ASHRAE, and we do not recommend using filters not rated under the MERV system.
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