One embodiment includes a latching mechanism having a latch, a cam and a slider. Each element extends substantially across the body and the elements are located in parallel relationship and generally oriented across the path of the air. An educt flows into the anode chamber and into the cathode chamber by means of a respective incoming stream. The thickness of the piezomaterial body is substantially less than either of the distances along first and second lateral dimensions that define the footprint. The infrared shielding film satisfies a following formula in a visible light wavelength region and at light incident angles of 0\xb0, 40\xb0 and 80\xb0: 0.