An air filtering device comprising: a device housing provided with an air inlet and an air outlet so that air flows from the inlet through the device housing and further to the outlet during operation of the air filtering device; wherein the device housing comprises at least a first and a second housing module (13, 14) arranged next to each other so that air flows through the first housing module before flowing through the second housing module during operation of the device, wherein at least one of the first and second housing modules (13, 14) is configured to be provided with an air filter (23, 24), wherein the first and second housing modules (13, 14) are connected via a first flange and a second flange, wherein the first flange is arranged on the first housing module and facing the second housing module, wherein the second flange is arranged on the second housing module and facing the first housing module, wherein a compressible gasket is arranged between the first and second flanges (13, 14), wherein the air filtering device further comprises an interlocking arrangement (50, 51, 52, 53, 54, 61, 62) configured to interlock the first and second housing modules (13, 14) and to force the first and second flanges (33, 34) towards each other so as to compress the gasket and form a proper seal when the first and second housing modules (13, 14) are interlocked, characterized in that the interlocking arrangement comprises a bracket that is connected to both the first and second housing modules (13, 14) by means of at least a first screw, wherein a first threaded screw hole for receiving the first screw is arranged in the first or second housing module, wherein the first threaded screw hole is accessible from an outside of the air filtering device and extends in a direction substantially parallel with a plane in which the first or the second flange (33, 34) is located, wherein a first conical guide surface is arranged around the first screw hole and wherein the first screw is provided with a corresponding second conical guide surface so that, when the first screw is fastened to the first screw hole and tightened therein, the first and second conical guide surfaces (61, 62) interact and force the first and second housing modules (13, 14), and thus also the first and second flanges (33, 34), towards each other, wherein the bracket is provided with an opening for allowing a threaded part of the first screw to pass through, and wherein the first conical guide surface is arranged in the bracket around the opening. a device housing provided with an air inlet and an air outlet so that air flows from the inlet through the device housing and further to the outlet during operation of the air filtering device; wherein the device housing comprises at least a first and a second housing module (13, 14) arranged next to each other so that air flows through the first housing module before flowing through the second housing module during operation of the device, wherein at least one of the first and second housing modules (13, 14) is configured to be provided with an air filter (23, 24), wherein the first and second housing modules (13, 14) are connected via a first flange and a second flange, wherein the first flange is arranged on the first housing module and facing the second housing module, wherein the second flange is arranged on the second housing module and facing the first housing module, wherein a compressible gasket is arranged between the first and second flanges (13, 14), wherein the air filtering device further comprises an interlocking arrangement (50, 51, 52, 53, 54, 61, 62) configured to interlock the first and second housing modules (13, 14) and to force the first and second flanges (33, 34) towards each other so as to compress the gasket and form a proper seal when the first and second housing modules (13, 14) are interlocked, characterized in that the interlocking arrangement comprises a bracket that is connected to both the first and second housing modules (13, 14) by means of at least a first screw, wherein a first threaded screw hole for receiving the first screw is arranged in the first or second housing module, wherein the first threaded screw hole is accessible from an outside of the air filtering device and extends in a direction substantially parallel with a plane in which the first or the second flange (33, 34) is located, wherein a first conical guide surface is arranged around the first screw hole and wherein the first screw is provided with a corresponding second conical guide surface so that, when the first screw is fastened to the first screw hole and tightened therein, the first and second conical guide surfaces (61, 62) interact and force the first and second housing modules (13, 14), and thus also the first and second flanges (33, 34), towards each other, wherein the bracket is provided with an opening for allowing a threaded part of the first screw to pass through, and wherein the first conical guide surface is arranged in the bracket around the opening.