Cartridge flange and filter system

A cartridge flange for fitting filter cartridges in filter systems (1000), of industrial suction-extraction systems or air-filter systems, the cartridge flange comprising an annular basic shape and three lugs (2) disposed so as to be offset by 120° on the external circumference each said lug (2) having one opening (100, 200, 300) for receiving bolts (11, 11′) for fastening the filter cartridge to the filter system (1000),

• wherein the lugs (2) are configured in such a manner that the bolts (11, 11′) having dissimilar radial spacings (r1, r2) from an imaginary center (M) of the annular basic shape of the cartridge flange to engage for final fastening of the cartridge flange,
• wherein each lug (2) comprises edges and bit sides (3, 4) wherein the bit sides (3,4) point in dissimilar directions,
• wherein the bit sides (3, 4) each have centrical longitudinal axes which display dissimilar spacing radii in relation to an imaginary center (M) of the annular cartridge flange.