The object of the invention is to develop a sieve shaker which is better adapted
to the product flow in the sifter, in particular plan sifter, and which is suitable in particular for very high outputs. The object is achieved by the features of claim 1 . The sieve shaker box comprises at least one sifting channel, the width of which is substantially wider than usual (conventional width is approx. 6 cm), preferably at least 1.5 times wider. For example, a width of approx. 13 cm.