Patent ID: 8727842

Claim:
A filter fan having a quadratic or rectangular shape said filter fan comprising a basic housing with a frame, said frame having spring-elastic clips for detachably mounting the filter fan in an opening in a mounting wall of a switchgear cabinet, wherein the frame comprises four side walls and mounting wall contact flanges, said mounting wall contact flanges extending outwardly from the side walls, wherein the four side walls are arranged perpendicular to a plane of a mounting wall of the switchgear cabinet, and the mounting wall contact flanges are arranged parallel to the mounting wall of the switchgear cabinet, said mounting wall contact flanges being in contact with the mounting wall of the switchgear cabinet when the frame of the basic housing of the filter fan is mounted in the opening of the mounting wall of the switchgear cabinet, wherein the four side walls have outer dimensions corresponding to dimensions of the opening of the mounting wall, wherein the four side walls and the mounting wall contact flanges of the frame extend continuously and without openings around a circumference of the filter fan so that the four side walls and the mounting wall contact flanges of the frame form continuously closed outer peripheral wall surfaces, wherein the spring-elastic clips are molded onto an outer side of the outer peripheral surface of the side walls of the frame, wherein the spring-elastic clips are not cut out of the side walls of the frame, wherein a gap exists between an outer edge of each of the spring-elastic clips and the mounting wall contact flanges of the frame of the basic housing of the filter fan, wherein the gap is between one and four millimeters in size.