20x20x2 MERV 13 Pleated Air Filter 6PK | 19.5x19.5x1.75 - Actual Size

20x20x2 MERV 13 Air Filter - Box of 6 Actual Size of Filter: 19 1/2 x 19 1/2 x 1� 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 13. 20x20x2 MERV 13 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 13 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 20x20x2 MERV 13 filters now for homes. Until recently; MERV 13 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 13 filters to maintain good indoor air quality in common types of spaces. 20 x 20 x 2 MERV 13 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 13 electrostatic air filters to help combat children�s respiratory infections and the effects of pollutants.