Abstract: An installation for the supply of fresh and/or heated air into the interior space of a motor vehicle which is equipped with an air guide channel within the area of the inner covering of a body part; the air guide channel is formed by a part of the inner wall of the vehicle body part and by a cover member mounted thereon and is in communication with the vehicle interior space by way of discharge openings directed into the vehicle interior space; recesses are thereby provided within the edge area of the cover member and/or within the inner covering adjoining the same or in the vehicle body part adjoining the cover member which form the discharge openings.