An environmental strip curtain holding apparatus for suspending a plurality of flexible transparent strips forming a curtain includes a bar suitable for mounting to fixed structure adjacent to a location requiring the presence of a strip curtain. The housing has first and second ends with an inlet and an outlet at the first end for the gas that is to be filtered, and a support surface on its internal wall at a point towards its second end. Besides, the clustering storage system mainly uses the determined path for backing up the data. The second current controller sinks the current from the output node in response to a second logic level of a second signal, and buffers and outputs the input voltage to the output node in response to a first logic level of the second signal. At the same time they have a high level of mechanical properties, and they can therefore be utilized without restriction for the customary application sectors and processing methods. The signal processing system may also control power consumption by adjusting the threshold.