Abstract: A device for adjusting an air volume flow, in particular in an air distribution network, has a central air channel which can be flowed through. The device has a throttle (6) which is arranged in the central air channel and which has at least a first throttle portion (60) having first blocking elements (601) and a second throttle portion (61) having second blocking elements (611). The position of the second blocking elements (611) can be changed relative to the first blocking elements (601) in order to change a size of a cross section of the air channel which can be flowed through. The first blocking elements (601) and the second blocking elements (611) are configured in such a manner that in approximately all positions between the first end position and the second end position in approximately any radial direction they form a portion of the cross section which can be flowed through.

Abstract: A device for adjusting an air volume flow, in particular in an air distribution network, has a central air channel which can be flowed through and a throttle which is arranged in the central air channel. A size of a cross section of the air channel which can be flowed through can be changed by a throttle, wherein the throttle has an adjustment mechanism for changing the cross section which can be flowed through. The device has in addition to the throttle a central flow element which is arranged in the air channel and which has a cover, the circumference of which increases in the direction away from the throttle. The adjustment mechanism can be activated with the device being mounted in a wall opening. This enables an optimum fine adjustment of the device.