The Advent utilizes the aspirator before the screening process to attain unmatched screening accuracy. This aspirator has proven to be the most efficient aspirator available and is used in many different processing plants. It is designed to create a streamlined flow vacuum that is drawn through the product. As the air flow is evenly distributed, the separation is more easily controlled and more accurate. An absence of a controlled flow will result in leaving light material in the good product or, if operated aggressively, heavy, good product in the liftings. As the clean product is discharged from the aspirator, it is gently lowered to the top deck of the Advent to begin the sizing process. The liftings are conveniently discharged for inspection and, if needed, adjustment to the air stream can be made.