Nozzle arrangement for an edge-strip application device, for exposing an adhesive-free, heat-activatable edge strip or workpiece or an edge strip or workpiece that is coated with hotmelt adhesive to hot air, comprising a nozzle body having - at least one air-inlet duct (20, 21) which is connectable to a hot-air generator such that pressurized hot air can be fed to the nozzle body during operation of the edge-strip application device, - at least two groups (4a, 4b, 4c) of air-outlet openings, wherein the air-outlet openings are configured in a manner spaced apart from one another in the vertical direction perpendicular to an advancing direction of the edge strip on an air-outlet surface, facing the edge strip, of the nozzle body and are connected in terms of flow to the at least one air-inlet duct (20, 21) such that the at least two groups (4a, 4b, 4c) of air-outlet openings are spaced apart from one another in the advancing direction of the edge strip and the hot air fed to the nozzle body can flow out of the air-outlet openings and can be exposed to a heat-activatable functional layer of the edge strip, - a number of closure members (6, 6') that corresponds to the number of groups (4a, 4b, 4c) of air-outlet openings, said closure members (6, 6') being configured such that at least some of the air-outlet openings can be selectively opened or closed so that the hot air outlet flow can be adapted to different widths of the fed edge strip, characterized in that - the nozzle body has a number of air-outlet ducts (27, 28, 29), configured preferably in a hollow-cylindrical manner, that corresponds to the number of groups (4a, 4b, 4c) of air-outlet openings, said air-outlet ducts (27, 28, 29) being connected in terms of flow to the at least one air-inlet duct (20, 21) and comprising the air-outlet openings, - the closure members (6, 6') are configured such that they can be guided axially into the air-outlet ducts (27, 28, 29) in order to close at least some of the air-outlet openings, and - the nozzle arrangement comprises a closure-member holder on which the closure members (6, 6') are fitted such that they are adjustable simultaneously in the air-outlet ducts (27, 28, 29), or comprises a closure-member holder on which the closure members (6, 6') are fitted such that at least one of the closure members is adjustable independently of the remaining closure members. - at least one air-inlet duct (20, 21) which is connectable to a hot-air generator such that pressurized hot air can be fed to the nozzle body during operation of the edge-strip application device, - at least two groups (4a, 4b, 4c) of air-outlet openings, wherein the air-outlet openings are configured in a manner spaced apart from one another in the vertical direction perpendicular to an advancing direction of the edge strip on an air-outlet surface, facing the edge strip, of the nozzle body and are connected in terms of flow to the at least one air-inlet duct (20, 21) such that the at least two groups (4a, 4b, 4c) of air-outlet openings are spaced apart from one another in the advancing direction of the edge strip and the hot air fed to the nozzle body can flow out of the air-outlet openings and can be exposed to a heat-activatable functional layer of the edge strip, - a number of closure members (6, 6') that corresponds to the number of groups (4a, 4b, 4c) of air-outlet openings, said closure members (6, 6') being configured such that at least some of the air-outlet openings can be selectively opened or closed so that the hot air outlet flow can be adapted to different widths of the fed edge strip, characterized in that - the nozzle body has a number of air-outlet ducts (27, 28, 29), configured preferably in a hollow-cylindrical manner, that corresponds to the number of groups (4a, 4b, 4c) of air-outlet openings, said air-outlet ducts (27, 28, 29) being connected in terms of flow to the at least one air-inlet duct (20, 21) and comprising the air-outlet openings, - the closure members (6, 6') are configured such that they can be guided axially into the air-outlet ducts (27, 28, 29) in order to close at least some of the air-outlet openings, and - the nozzle arrangement comprises a closure-member holder on which the closure members (6, 6') are fitted such that they are adjustable simultaneously in the air-outlet ducts (27, 28, 29), or comprises a closure-member holder on which the closure members (6, 6') are fitted such that at least one of the closure members is adjustable independently of the remaining closure members.