A higher negative pressure is required for extracting hand tools than for stationary machines. For this reason, a DM unit is not suitable for tool extraction as standard. That is, until now. Because now it is possible to place an extra high-pressure fan in the fan compartment of the MD-150 and larger, with which the tools can be properly extracted via a separate, thin pipe. The dust automatically ends up in the collection trays of the unit. It is not necessary that it is in operation.