The air flow influencing device has a closure part in the form of a plate body (6) which also carries the air guide elements. The servicing elements for the air guide elements (11, 12) and the guide for the movement of the plate body in its casing are also part of the plate body. The plate body has endface wall parts (7, 8) moulded onto it. These parts are polygonal in outline, e.g. triangular. The endface wall parts have holders for the attachment of at least one air guide element, which can be moved in guides in the casing to set the plate body.
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