Abstract: An air distribution system comprises at least one air conduit, at least one air outlet, at least one flow restrictor, at least one sensor for acquiring an air state and at least one control unit. The air outlet is connected to the air conduit, the flow restrictor is positioned on the air conduit, and the control unit is connected to the sensor. The control unit is designed, in the case of any deviation of a measured air state at the air outlet from a predetermined desired air-state, to cause the flow restrictor to vary its aperture cross section. In particular in the case of air distribution systems comprising a multitude of air outlets efficient and quick trimming can take place in this manner.