Arrangement, including a rack housing for receiving a plurality of plugin components and an exhaust air unit arranged on the rack housing with at least two fan units for suctioning-off heated air, wherein the rack housing includes the following: - a plurality of plugin positions for receiving the plurality of plugin components in a first region bordering a first housing side of the rack housing, - a negative-pressure duct in a second region of the rack housing that borders the first region, and - a partitioning wall arranged between the first region and the second region, wherein first openings are arranged in the partitioning wall between the negative-pressure duct and the plugin components, which allow evacuating air heated by the plugin components into the negative-pressure duct, characterized by - at least two second openings of the rack housing for suctioning-off the heated air from the negative-pressure duct, which are assigned to the at least two fan units of the exhaust air unit, in order to generate the reduced air pressure in the negative-pressure duct, - at least two non-return arrangements arranged in the negative-pressure duct and assigned to the two second openings in such a way, that they prevent air from entering through the respectively assigned second opening, if no air is suctioned-off through this second opening, - at least one partitioning wall arranged between the at least two non-return arrangements and at least in part in the negative-pressure duct for increasing a flow resistance between the two second openings, which separates the second openings from one another in an air-technical manner, so that no short-circuiting flow occurs between the two second openings upon a failure of an exhaust device for the heated air, - at least one first pressure sensor in the region of the negative-pressure duct and - at least one control means connected to the at least one first pressure sensor and the at least two fan units for controlling the fan units depending on the pressure in the negative-pressure duct measured by the first pressure sensor. - a plurality of plugin positions for receiving the plurality of plugin components in a first region bordering a first housing side of the rack housing, - a negative-pressure duct in a second region of the rack housing that borders the first region, and - a partitioning wall arranged between the first region and the second region, wherein first openings are arranged in the partitioning wall between the negative-pressure duct and the plugin components, which allow evacuating air heated by the plugin components into the negative-pressure duct, - at least two second openings of the rack housing for suctioning-off the heated air from the negative-pressure duct, which are assigned to the at least two fan units of the exhaust air unit, in order to generate the reduced air pressure in the negative-pressure duct, - at least two non-return arrangements arranged in the negative-pressure duct and assigned to the two second openings in such a way, that they prevent air from entering through the respectively assigned second opening, if no air is suctioned-off through this second opening, - at least one partitioning wall arranged between the at least two non-return arrangements and at least in part in the negative-pressure duct for increasing a flow resistance between the two second openings, which separates the second openings from one another in an air-technical manner, so that no short-circuiting flow occurs between the two second openings upon a failure of an exhaust device for the heated air, - at least one first pressure sensor in the region of the negative-pressure duct and - at least one control means connected to the at least one first pressure sensor and the at least two fan units for controlling the fan units depending on the pressure in the negative-pressure duct measured by the first pressure sensor.