The present invention provides a method of scaling a partial area of a main picture, by which the partial area of the main picture can be magnified in a manner of scaling the partial area of the picture displayed on a screen like using a virtual magnifier without employing a separate expensive hardware resource. The shield is formed of a soft thermoplastic elastomeric, e. Data bits are read from the programmed selected memory cells. Downlink signals are in signal communication with the first cylindrical waveguide section so that the downlink signals are launched into the outer waveguide and out of the feed. Embodiments may also be configured to minimize andor inhibit air exiting from the air outlet of the air treatment device from immediately reentering the air inlet and thus being recirculated.