A device for producing a three-dimensional object by solidifying, layer-by-layer, building material at locations in a respective layer corresponding to the cross-section of the object to be produced, the device comprising: a support on which the object is to be constructed, an application device (12 -14) for purposes of applying a layer of the building material onto the support , or onto a previously, at least selectively, solidified layer of the building material in a working plane , a solidifying device for purposes of selective solidification of the building material in the applied layer and a flow device for purposes of generating a gas flow onto a side of the applied layer of the building material facing away from the support , wherein the gas flow is configured to stream over the working plane , and wherein the flow device contains a nozzle element (40; 70) for purposes of introducing the gas flow into the device, wherein the nozzle element (40; 70) contains: a body (41; 71) with a gas inlet side (44; 74) and a gas outlet side (46; 76), and a plurality of channels (42; 72) which penetrate the body (41; 71) from the gas inlet side (44; 74) to the gas outlet side (46; 76), are provided with inlet openings (45; 75) on the gas inlet side (44; 74) and gas outlet openings (47; 77) on the gas outlet side (46; 76), and which are separated by walls (43; 73), wherein the total cross-sectional area of the walls (43; 73) is smaller than the total cross-sectional area of the channels (42; 72), wherein the channels are designed and dimensioned such that a laminar flow is formed in them at the gas outlet side (46; 76). a support on which the object is to be constructed, an application device (12 -14) for purposes of applying a layer of the building material onto the support , or onto a previously, at least selectively, solidified layer of the building material in a working plane , a solidifying device for purposes of selective solidification of the building material in the applied layer and a flow device for purposes of generating a gas flow onto a side of the applied layer of the building material facing away from the support , wherein the gas flow is configured to stream over the working plane , and wherein the flow device contains a nozzle element (40; 70) for purposes of introducing the gas flow into the device, wherein the nozzle element (40; 70) contains: a body (41; 71) with a gas inlet side (44; 74) and a gas outlet side (46; 76), and a plurality of channels (42; 72) which penetrate the body (41; 71) from the gas inlet side (44; 74) to the gas outlet side (46; 76), are provided with inlet openings (45; 75) on the gas inlet side (44; 74) and gas outlet openings (47; 77) on the gas outlet side (46; 76), and which are separated by walls (43; 73), wherein the total cross-sectional area of the walls (43; 73) is smaller than the total cross-sectional area of the channels (42; 72), wherein the channels are designed and dimensioned such that a laminar flow is formed in them at the gas outlet side (46; 76). a body (41; 71) with a gas inlet side (44; 74) and a gas outlet side (46; 76), and a plurality of channels (42; 72) which penetrate the body (41; 71) from the gas inlet side (44; 74) to the gas outlet side (46; 76), are provided with inlet openings (45; 75) on the gas inlet side (44; 74) and gas outlet openings (47; 77) on the gas outlet side (46; 76), and which are separated by walls (43; 73), wherein the total cross-sectional area of the walls (43; 73) is smaller than the total cross-sectional area of the channels (42; 72), wherein the channels are designed and dimensioned such that a laminar flow is formed in them at the gas outlet side (46; 76). <EOS>