Dust-generating work is a particular challenge in occupied rooms. Neighboring areas should remain dust-free, in order to keep the cleaning effort to a minimum and to protect the health of the residents. A dust protection wall prevents dust from getting outside the work area. The dust is guided out of the room in a targeted manner by the air purifier, and the air quality in the work area is consequently improved. Surrounding rooms remain free of dust. The hose can be easily attached to the air purifier with an adapter plate, and thus integrated into a dust protection wall. Or it can also be positioned directly at the dust source. This reduces the dispersion of dust particles in the room in a targeted manner.