A gas cleaning device comprising: - a filter cartridge with a filter medium and at least a first filter terminal , - a duct comprising: o a duct wall enclosing a duct volume with an upstream gas inlet and a downstream gas outlet, o a filter support, wherein the filter support removably supports the filter cartridge in the duct volume in between of the gas inlet and the gas outlet, o at least a first duct terminal , and - a gas ionizer , wherein the gas ionizer comprises at least a first ionizer electrode and a second ionizer electrode , a first ionizer terminal and a second ionizer terminal , wherein the first ionizer terminal is electrically connected to the first ionizer electrode and the second ionizer terminal is electrically connected to the second ionizer electrode characterized in that (i) in a state in which insertion of the filter cartridge in the filter support is completed, the first duct terminal contacts the first filter terminal and the first ionizer terminal is electrically connected with the first duct terminal via the first filter terminal , and (ii) in a state of non-insertion of the filter cartridge in the filter support, the first duct terminal does not contact the first filter terminal and the first ionizer terminal is electrically disconnected from at least the first duct terminal . - a filter cartridge with a filter medium and at least a first filter terminal , - a duct comprising: o a duct wall enclosing a duct volume with an upstream gas inlet and a downstream gas outlet, o a filter support, wherein the filter support removably supports the filter cartridge in the duct volume in between of the gas inlet and the gas outlet, o at least a first duct terminal , and o a duct wall enclosing a duct volume with an upstream gas inlet and a downstream gas outlet, o a filter support, wherein the filter support removably supports the filter cartridge in the duct volume in between of the gas inlet and the gas outlet, o at least a first duct terminal , and - a gas ionizer , wherein the gas ionizer comprises at least a first ionizer electrode and a second ionizer electrode , a first ionizer terminal and a second ionizer terminal , wherein the first ionizer terminal is electrically connected to the first ionizer electrode and the second ionizer terminal is electrically connected to the second ionizer electrode characterized in that (i) in a state in which insertion of the filter cartridge in the filter support is completed, the first duct terminal contacts the first filter terminal and the first ionizer terminal is electrically connected with the first duct terminal via the first filter terminal , and (ii) in a state of non-insertion of the filter cartridge in the filter support, the first duct terminal does not contact the first filter terminal and the first ionizer terminal is electrically disconnected from at least the first duct terminal . (i) in a state in which insertion of the filter cartridge in the filter support is completed, the first duct terminal contacts the first filter terminal and the first ionizer terminal is electrically connected with the first duct terminal via the first filter terminal , and (ii) in a state of non-insertion of the filter cartridge in the filter support, the first duct terminal does not contact the first filter terminal and the first ionizer terminal is electrically disconnected from at least the first duct terminal . <EOS>