Filter fan with a quick fixing device

A filter fan, comprising a basic casing with a rectangular frame having four side walls, wherein the frame is provided with quick fixing devices formed by elastic snap-in elements provided as spring-elastic brackets for removable fixing of the filter fan on a peripheral mounting edge of a cut out in a mounting wall of a switch cupboard, wherein said four side walls are connected with each other so as to form the rectangular frame, wherein the four side walls are not disposed within a common plane, wherein contact surfaces for contacting the mounting wall when the filter fan is fixed on the peripheral mounting edge of the cut out in the mounting wall protrude from each side wall outwards at an angle of substantially 90°, wherein the contact surface of each side wall is connected with a neighboring contact surface so as to form a continuous collar protruding from said frame, wherein said four side walls of the frame and said collar each have a continuously closed outer peripheral surface, wherein several plate-shaped blanks which form the snap-in elements are configured on the outer peripheral surface of the side walls of the frame, each of said plate-shaped blanks being molded directly onto the outer peripheral surface of the side walls of the frame and wherein each of the plate-shaped blanks is provided with a plurality of substantially parallel slits for constituting a number of parallel spring-elastic snap-in tongues so that a snap-in connection to the peripheral mounting edge of the cut out in the mounting wall can be established.