Abstract: A device for dusting flat products such as printed matter with a powder includes a powder box open toward a product transport surface on which a plurality of the products which are to be dusted are moved. The powder box has a powder nozzle arrangement including a first plurality of compressed air/powder delivering nozzles arranged transversely to a product transport direction at an upstream edge of the powder box, and a second similar nozzle arrangement at a downstream edge of the powder box, the two nozzle arrangements cooperating to product an air current directed towards the product transport surface. First and second suction nozzle arrangements are also similarly provided, respectively downstream of the first air nozzle arrangement and the second air nozzle arrangement, both suction nozzle arrangements also being oriented transversely to the product transport surface.