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Comparison of (a) frame with a porous medium installed for “Gen. III” unit and “Gen. IV” unit. In (a), the separator is not included but sits on top of the exposed side of the porous medium instead. In (b), the separator is integrated down at the bottom of the frame. The thickness of the parts is 10 mm both in (a,b). (c) shows frequency curves for the materials used and glass frit used before as a reference.
