Abstract: A self cleaning apparatus for use in separating material from air in a material-air conveyance system includes an outer housing and a perforated inner housing. A freely pivotable panel member is hingedly mounted on the outer housing, the panel normally being in the open position thus exposing an aperture in the outer housing. When a conveyance cycle is initiated, a downstream blower initially draws air into the system through the aperture in the collector outer housing thus blowing inwardly particles lodged in the perforate inner housing. The negative pressure of the air being thus drawn in the system acts to close the panel member until the conveyance cycle is completed and the downstream blower switched off. The force of gravity then pulls the panel member back to its normally open position until another conveyance cycle is initiated.