Double-glazed thermoinsulated external wall particularly for windows or the facade of buildings, constituted by an outer pane and an inner pane, parallel to one another and defining a space, wherein the wall comprises a forced air circulation unit in the space. The group of the lines includes a first line and a second line. A method for the production of such a dispersion is provided such that the dispersion is produced by applying a strong accelerating voltage. The processor may determine from the bid-offer pairs a qualifying set of overlapping bid-offer pairs. A paper pressing device guides a leading end of the succeeding sheet transferred from the first conveyor to the second conveyor, and presses the leading end of the succeeding sheet downward; i.