Treatment machine for flexible material webs, in particular in the form of a plastic film which can be passed through treatment furnaces, said treatment machine having the following features: - the treatment machine comprises at least two successive zones in an extraction direction of the material web, - at least one neutral zone is provided between at least two successive zones in the extraction direction, - the zone upstream from the at least one neutral zone comprises a zone outlet wall provided with an outlet slot and/or a neutral zone wall, through which the material web exits in the extraction direction from the upstream zone into the neutral zone, - the zone subsequent to the neutral zone in the extraction direction, comprises a zone inlet wall and/or a neutral zone wall, which is provided with an inlet slot through which the material web enters the trailing zone in the extraction direction (a), - in the at least one neutral zone, a nozzle arrangement (15v, 15n) is provided, adjacent to a zone exit wall and/or a leading neutral zone wall on the one hand, and/or adjacent to the chamber inlet wall and/or a trailing neutral zone wall on the other hand, via which nozzle arrangement is provided, via which a gaseous fluid flow reaching a material web is generated, characterised by the following further features: the nozzle arrangement of the nozzle arrangement leading in the neutral zone and/or the nozzle arrangement trailing in the neutral zone is designed in such a way - that the respective gaseous fluid flow is directed at a slightly oblique angle (a) of less than 45° in the direction of the adjacent zone exit wall and/or the leading neutral zone wall or the zone inlet wall and/or the trailing neutral zone wall, and - that the nozzle arrangement is formed such that the gaseous fluid flow flows following the zone exit wall or the leading neutral zone wall or the zone inlet wall and/or the trailing neutral zone wall as far as the material web. - the treatment machine comprises at least two successive zones in an extraction direction of the material web, - at least one neutral zone is provided between at least two successive zones in the extraction direction, - the zone upstream from the at least one neutral zone comprises a zone outlet wall provided with an outlet slot and/or a neutral zone wall, through which the material web exits in the extraction direction from the upstream zone into the neutral zone, - the zone subsequent to the neutral zone in the extraction direction, comprises a zone inlet wall and/or a neutral zone wall, which is provided with an inlet slot through which the material web enters the trailing zone in the extraction direction (a), - in the at least one neutral zone, a nozzle arrangement (15v, 15n) is provided, adjacent to a zone exit wall and/or a leading neutral zone wall on the one hand, and/or adjacent to the chamber inlet wall and/or a trailing neutral zone wall on the other hand, via which nozzle arrangement is provided, via which a gaseous fluid flow reaching a material web is generated, - that the respective gaseous fluid flow is directed at a slightly oblique angle (a) of less than 45° in the direction of the adjacent zone exit wall and/or the leading neutral zone wall or the zone inlet wall and/or the trailing neutral zone wall, and - that the nozzle arrangement is formed such that the gaseous fluid flow flows following the zone exit wall or the leading neutral zone wall or the zone inlet wall and/or the trailing neutral zone wall as far as the material web.