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 (7, 8, 9) 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 (7, 8, 9), 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 (31, 32, 34, 35) for purposes of generating a gas flow onto a side of the applied layer of the building material facing away from the support (7, 8, 9), 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 (7, 8, 9) 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 (7, 8, 9), 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 (31, 32, 34, 35) for purposes of generating a gas flow onto a side of the applied layer of the building material facing away from the support (7, 8, 9), 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).