An electronic device housing which may be cooled via a heat pump is provided. In particular, precise lipid compositions and fuel properties are required for approval of biofuels. Each sampled password element that is grouped according to each category that is randomly sampled from said categories is displayed, in random order, together with a plurality of scramble elements, on a display device 17. The lateral header connecting portion comprises at least one of the at least one header fastening means. The use of FRP to form the framework walls allows creation of large units that are suitable for use in municipal and industrial settings, which was not possible previously.