
MERV is an abbreviation for Minimum Efficiency Reporting Value. The MERV rating of furnace air filter indicates how well it catches microscopic particles that you don’t want to escape into your home, such as dust, pollen, mold, and other irritants. The MERV rating of a filter determines how effective it is in trapping airborne particles. The greater the MERV rating, the better. It represents the lowest potential performance of any filter.
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