A filling machine configured to form, fill, and seal individual packages is provided. The filling machine comprises a sterilization station configured to provide a flow of gaseous sterilizing agent towards open ends of ready-to-fill packaging containers passing through said sterilization station. The filling machine comprises at least one clean air supply and at least one baffle plate arranged above the at least one clean air supply, wherein the air supply is configured to direct a stream of clean air towards the ready-to-fill packaging containers. The clean air supply in turn comprises at least one distribution pipe and wherein the distribution pipe extends in a horizontal direction, the horizontal direction being in the direction of the flow of packages through the filling machine.