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A diagram of the Performer, showing the different parts of the active passive heat moisture exchanger. (1) The single antimicrobial filter; 2 and 4, the two cellulose membranes (hygroscopic and hydrophobic elements); 3, thin metal element with the small holes (diameter 0.3–0.5 cm); and 5, port through which the water is added. The control box (the Provider) for the heating plate has three settings (1, 2 and 3) for temperatures of 40, 50 and 60°C.
