A displacement air outlet having - a long tube body having a longitudinal axis , which tube body has a casing with perforations, wherein an interior of the tube body , which is enclosed by the casing , forms a first air distribution space , - an air-intake cross section of the tube body , which leads into the interior and which is arranged at a first end of the tube body , - an air-discharge cross section which is formed by the perforations of the casing , - an overflow cross section which leads out of the interior of the tube body and which forms a flow connection to a second air distribution space and is arranged at a second end of the tube body which is opposite the first end , - a nozzle body which connects to the second end of the tube body , the interior of which nozzle body forms the second air distribution space and which nozzle body is provided with at least one air-discharge cross section in the form of a nozzle , - a closure element which is arranged in such a manner that it closes the overflow cross section in a closed position and clears the overflow cross section in an open position, - the ratio of the area of the overflow cross section to the area of the cross section of the first air distribution space being at least 0.6, preferably at least 0.7, further preferably at least 0.75, even more preferably at least 0.8, characterized in that - a central region (Z) of the first air distribution space - which region, as viewed in the direction of the longitudinal axis of the first air distribution space , extends from the air-intake cross section up to the overflow cross section and, as viewed in the radial direction, extends from the longitudinal axis up to a radius of at least 50 %, preferably at least 60 %, further preferably at least 70 % of the radius of the casing - is free from internals of any type. - a long tube body having a longitudinal axis , which tube body has a casing with perforations, wherein an interior of the tube body , which is enclosed by the casing , forms a first air distribution space , - an air-intake cross section of the tube body , which leads into the interior and which is arranged at a first end of the tube body , - an air-discharge cross section which is formed by the perforations of the casing , - an overflow cross section which leads out of the interior of the tube body and which forms a flow connection to a second air distribution space and is arranged at a second end of the tube body which is opposite the first end , - a nozzle body which connects to the second end of the tube body , the interior of which nozzle body forms the second air distribution space and which nozzle body is provided with at least one air-discharge cross section in the form of a nozzle , - a closure element which is arranged in such a manner that it closes the overflow cross section in a closed position and clears the overflow cross section in an open position, - the ratio of the area of the overflow cross section to the area of the cross section of the first air distribution space being at least 0.6, preferably at least 0.7, further preferably at least 0.75, even more preferably at least 0.8, characterized in that - a central region (Z) of the first air distribution space - which region, as viewed in the direction of the longitudinal axis of the first air distribution space , extends from the air-intake cross section up to the overflow cross section and, as viewed in the radial direction, extends from the longitudinal axis up to a radius of at least 50 %, preferably at least 60 %, further preferably at least 70 % of the radius of the casing - is free from internals of any type. <EOS>