The invention exhibits an apparatus for improving the aerodynamics of a commercial vehicle having a cab with doors and below-situated footboards for climbing in and out, and having a front panel in which air inlets are present, wherein the air inlets are connected, via air ducts in or on the panel, to the front wheel case of the commercial vehicle and to an air outlet, wherein the at least one footboard of the cab can be folded away and has at least one through-flow region in the vehicle longitudinal direction.