I haven't found ANY media filter that can catch small particles that is anything but a big flat board across the return. Static pressure's right off the chart and I don't care what their claim is. The machine tells the tale. If you want clean air without high static (assuming the ducts are properly sized) then spring for a good electronic air cleaner. The false savings with the media filters is revealed in the electrical consumption. A VS motor will hog a huge wattage when things are restricted. Much more than a standard motor that just loads down and draws less. If you want the true savings of a VS motor, it is mandatory that the ESP is low. Period.