A device for transforming parisons into containers with a plurality of transforming stations which are disposed on a movable carrier, wherein the transforming stations each have blow molds, within which the parisons can be transformed into containers by a supply of a flowable medium, and blow mold supports for holding these blow molds, wherein the blow mold supports have at least two blow mold support parts which are movable relative to one another for opening and closing the blow molds, with a clean room which is demarcated with respect to the surroundings by means of at least one wall and which at least partially surrounds the individual transforming stations, so that the transforming stations are movable within this clean room, and with at least one supply unit in order to supply flowable sterilizing medium to at least one region of the transforming stations which are movable within the clean room.