The Wilkerson MSP-95-992 .5 Micron Repl Filter Element is a vital component utilized in HVAC systems which improve air quality through the elimination of fine particles and contaminants from the air. This replacement filter element reliably collects pollen, dust, microbes from mold, and other airborne contaminants with a filtering capacity of 0.5 microns. https://www.partshnc.com/msp-95-992-wilkerson-5-micron-repl-filter-element