24x24x4 MERV 11 Pleated Air Filter 3PK | 23.375x23.375x3.625 - Actual Size

24x24x4 MERV 11 Air Filter - Box of 3 Actual Size of Filter:23.375 x 23.375 x 3.625 Air filters are ranked in a minimum efficiency rating value (MERV) system. The higher the MERV rating; the better the filter can filter out all airborne particulates. Since we are constantly trying to improve indoor air quality; it only makes sense that we would offer air conditioner filter MERV 11. 24x24x4 MERV 11 filters are right on the cusp of being classified as �medium efficiency MERV pleated air filters� and �high efficiency MERV pleated air filters.� Filters that have received a rating of MERV 7-13 are about as effective as true HEPA filters at controlling a majority of airborne particles. This is able to happen more effectively as the filter gets dirty. However; MERV ratings of 13-16 are able to remove and capture smaller particle sizes even before the filter starts to become dirty. With the first air exchange; MERV 11 filters have over a 75% efficiency of removing airborne particulates that are between 0.3u and 1.0u in size. When the average particle size is 1.0u to 3.0U; the filters efficiency jumps to over 90%! We are very proud that we offer these great 24x24x4 MERV 11 filters now for homes. Until recently; MERV 11 air filters were commonly found in: communication centers; telephone terminal rooms; biological laboratories; biomedical laboratories; chemistry laboratories; and physics laboratories. This means the type of filter should be selected based on the specific building location; occupancy; air quality issues and type and operation of the HVAC system. However; it is reasonable to specify at least MERV 11 filters to maintain good indoor air quality in common types of spaces. 24x24x4 MERV 11 filters are pleated; electrostatically charged filters. The electrostatic charge of the filters works as a magnet and draw airborne particles to them. A lot of schools are starting to implement MERV 11 electrostatic air filters to help combat children�s respiratory infections and the effects of pollutants.