back wall (38) for a windfall chamber (18) of a scattering machine (10),where the spreading machine (10) is used to form a moulding mat (12) on a moulding band (14) during the production of material plates in a production direction (16), characterized by the fact that the back wall (38) is at least an outer back part (40) and has at least one internal rear wall part (42), between which at least one suction duct (46) for the extraction of air and particulates from the interior (44) of the windscreen chamber (18) is realized, with at least one suction duct (46) at least one suction duct (50) to the interior (44) de r Wind chamber (18)which is located in or adjacent to at least one internal rear wall part (42) and at the height of one at the normal operating position of the sprinkler (10) spatially below the edge of at least one suction outlet (50) at least one outlet (56) above e Interior (58) of at least one interior rear wall part (42) to the interior of the wind room (18).
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