An Air Filter for a screw compressor is the primary line of defense for the entire system. Its job is to capture atmospheric dust, pollen, and abrasive particles before they reach the intake valve and the high-precision rotors of the air-end. In a rotary screw compressor, even microscopic particles act like "sandpaper" on the rotors, which can lead to premature wear, loss of pressure, and eventual air-end failure.