Abstract: A filter cassette having a fanfolded filter medium against which a thin wed strip is cemented on each fanfolded face by means of an edge gluing machine such that on the upstream side it projects slightly over the filter medium. To hold the filter cassette in the filter housing there is a clamping frame, which reaches over the edge of the filter cassette and forces the protruding, upstream side face of the outer strip into a seal of the filter housing and whose two opposing sides have a surface prong that reaches into the outermost fanfold of the filter medium and pushes it into another seal of the filter housing.