Filter arrangement for filtering dust-laden air generated by a hand-guided power tool having a pneumatic or electric motor, in particular a sander or a grinder, during operation of the power tool, the filter arrangement comprising a filter cartridge having - a hollow casing having a longitudinal extension along a longitudinal axis, - a hollow filter element located inside the casing, having a longitudinal extension along said longitudinal axis of the hollow casing, - an air inlet port provided in the casing, the air inlet port located upstream with respect to an airflow through the filter cartridge and with respect to the filter element, the air inlet port adapted to be pneumatically connected to the power tool in order to allow the dust-laden air generated by the power tool to flow into the casing, and - an air outlet port provided in the casing, the air outlet port located downstream with respect to the airflow through the filter cartridge and with respect to the filter element, the air outlet port adapted to allow filtered air leave the filter cartridge, wherein an external essentially hollow-cylindrical input chamber of the filter cartridge is formed between the casing and the filter element, an internal essentially cylindrical output chamber of the filter cartridge is formed inside the filter element, a conical head portion of the filter cartridge separates the first input chamber from the second output chamber, the internal chamber is closed by means of the conical head portion at a first end of the internal chamber facing towards the air inlet port, the external chamber is in pneumatic connection with the air inlet port and the internal chamber at a second end opposite to the first end is in pneumatic connection with the air outlet port, characterized in that the filter arrangement comprises an active airflow generating device with a fan comprising a plurality of blades and driven by an electric motor separate from the motor of the power tool, and further with an air inlet being in pneumatic connection with the air outlet port and the internal chamber of the filter cartridge in order to generate or support the airflow through the filter cartridge. - a hollow casing having a longitudinal extension along a longitudinal axis, - a hollow filter element located inside the casing, having a longitudinal extension along said longitudinal axis of the hollow casing, - an air inlet port provided in the casing, the air inlet port located upstream with respect to an airflow through the filter cartridge and with respect to the filter element, the air inlet port adapted to be pneumatically connected to the power tool in order to allow the dust-laden air generated by the power tool to flow into the casing, and - an air outlet port provided in the casing, the air outlet port located downstream with respect to the airflow through the filter cartridge and with respect to the filter element, the air outlet port adapted to allow filtered air leave the filter cartridge, wherein an external essentially hollow-cylindrical input chamber of the filter cartridge is formed between the casing and the filter element, an internal essentially cylindrical output chamber of the filter cartridge is formed inside the filter element, a conical head portion of the filter cartridge separates the first input chamber from the second output chamber, the internal chamber is closed by means of the conical head portion at a first end of the internal chamber facing towards the air inlet port, the external chamber is in pneumatic connection with the air inlet port and the internal chamber at a second end opposite to the first end is in pneumatic connection with the air outlet port, characterized in that the filter arrangement comprises an active airflow generating device with a fan comprising a plurality of blades and driven by an electric motor separate from the motor of the power tool, and further with an air inlet being in pneumatic connection with the air outlet port and the internal chamber of the filter cartridge in order to generate or support the airflow through the filter cartridge. wherein an external essentially hollow-cylindrical input chamber of the filter cartridge is formed between the casing and the filter element, an internal essentially cylindrical output chamber of the filter cartridge is formed inside the filter element, a conical head portion of the filter cartridge separates the first input chamber from the second output chamber, the internal chamber is closed by means of the conical head portion at a first end of the internal chamber facing towards the air inlet port, the external chamber is in pneumatic connection with the air inlet port and the internal chamber at a second end opposite to the first end is in pneumatic connection with the air outlet port, characterized in that the filter arrangement comprises an active airflow generating device with a fan comprising a plurality of blades and driven by an electric motor separate from the motor of the power tool, and further with an air inlet being in pneumatic connection with the air outlet port and the internal chamber of the filter cartridge in order to generate or support the airflow through the filter cartridge.