The invention relates to a window glazing comprising at least two window panes with an intermediate ventilated space arranged therebetween, wherein at least one window pane is provided with a layer which is arranged on the interior side therefore and whose transmission is controllable. More specifically, said invention relates to a multilayer glazing comprising corresponding intermediate spaces in which a sweeping gas circulates, wherein said sweeping gas consists of a mixture of air and other gaseous components in which the sweeping gas content is adjustable.