Steam condenser for the exhaust air of a cleaning apparatus and method for establishing a vapor barrier

Steam condenser for the exhaust air of a cleaning device, in particular a cleaning and disinfecting apparatus, which communicates with the interior of the cleaning device in connection with at least one inlet opening (1) for the inlet of the water vapor from the interior of the cleaning device and at least one nozzle (2) for spraying of cold water for the condensation of the entering into the condenser from the interior of the cleaning device the water vapor, wherein the at least one inlet opening (1) and the at least one nozzle (2) are arranged in cross-current to one another, characterized in that a bypass (6) within the steam condenser is arranged.