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MERV stands for Minimum Efficiency reporting value. Simply put MERV represents the amount of particles a filter will remove from the air. For example the higher the MERV rating the smaller particles the filter will remove resulting in more pollutants being removed from the air. Most common Air Filters range from MERV 4 to 6 for your 30 day filters (Panel air filters) and MERV 8, MERV 11 and MERV 13 for your 90 day air filters (pleated air filters).