12x20x1 Pleated Air Filter MERV 11 - Highest Quality - 6 Pack - (Actual Size: 11.5 X 19.5 X .75)Visit our online store: www.airexco.com. The 82-R MERV 11 Pleated filters are used for all commercial, industrial and residential applications. The filter media is a 100% synthetic, electrostatically charged media. This results in a higher efficient filter, 80-85 @ 3-5 micron, over 90% @ 7-10 micron without sacrificing airflow. Initial resistance of a 2" deep filter is just .36" w.g. @ 500 FPM. The enclosing frame of the 82-R is constructed of a rigid moisture resistant beverage board. The support members are bonded to each pleat on both sides to insure pleat spacing and stability. The filter pack is bonded to the inside periphery eliminating the possibility of air bypass. The media support grid is available in expanded wire with an effective open area of not less than 96%. The wire grid is bonded to the filter media to eliminate the possibility of media oscillation and media pull away.