The rectangular screeners are equipped with two vibrating motors rotating in opposite directions. This dual motor configuration causes the screens frame to vibrate in a linear or straight-line motion perpendicular to the plane of the motors. When two vibratory motors of the same frequency are fixed to a rigid common base, which is freely suspended, or supported and run in opposite directions to each other, they automatically synchronize to produce a straight line motion. When this motion is applied to a horizontal screens, the result is a horizontal action screens suitable for screening, conveying and dewatering of a large variety of products in limited headroom situations. The rectangular screens can be adapted by the factory to meet special requirements regarding plant layout and environmental constraints.