Abstract: The invention relates to a closing screen for a ventilation opening, in particular for a ventilation opening for a motor vehicle, comprising at least one molded part (1) for fastening to the ventilation opening and at least one ventilation flap (6, 7), which closes an opening (4) embodied in the molded part (1) and which automatically allows for an air escape from the space via the opening (4) in response to an overpressure in an assigned space. To eliminate the appearance of annoying rattling noises during operation in such a closing screen and to enable a cost-efficient production of the closing screen, the molded part (1) and the at least one ventilation flap (6, 7) according to the invention are made of flexible, closed-cell foam, wherein the at least one ventilation flap (6, 7) is connected to the molded part (1) by means of a material connection or integrally.