Patent ID: 8870994

Claim:
A filter cassette for removal of particles from an air stream, said filter cassette having an upstream end and a downstream end and comprising a mounting frame to which a filter media is fitted and which has a mounting face adapted for mounting the filter cassette to an opening of a partition, wherein said mounting face is positioned between the filter cassette's upstream and downstream ends at a first distance from said upstream end and a second distance from said downstream end, each of said first and second distances amounting to more than 10% of an overall length of the filter cassette, wherein said filter media comprises a plurality of filter panels extending in an upstream-to-downstream direction, wherein said filter panels are interconnected alternately at their upstream and downstream ends and side walls connecting adjacent filter panels are provided so that fluid passing through the filter cassette is forced to pass through said filter panels, wherein said mounting frame is connected to said filter panels in an area of the filter cassette where the filter cassette is to be mounted to said partition by means of said mounting face, and wherein upstream of said mounting frame said side walls are provided only between downstream surface sides of adjacent filter panels.