The Filter Queen cones are multi layered, highly compressed, interwoven layers of cellulose. They are meant to be smooth as the air current is supposed to create a cyclonic action that airwashes the dust off of the cone for maintained power. But sometimes the dust gets too thick and sticks to the cone. But if you take out the motor and leave the cone as it was, then flick it lightly with your finger in various spots from the inside, every so often, that can clean the cone and greater restore power for the next time the unit runs.
Otherwise as it runs with the genuine Filter Queen cone and MediPur filter virtually no dust of any kind passes through that cone. The only time the premotor filter gets dirt on it is when people take off the motor while fan hasn't fully stopped and disturb the cone so that dust falls inside the clean area. Also any time a cone is replaced, the gasket should be wiped. You should create a clean seal with rubber to cone to motor!!
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(State College, PA) 
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