| 摘要 |
The present invention relates to a double window system. The double window system comprises: an outer window frame; an inner window frame; at least one outer window; and at least one inner window. The present invention comprises: an internal outer window frame having an inner side surface portion of the internal outer window frame; an external outer window frame having a ceiling surface portion of the external outer window frame; an outer window frame corrugated coupling portion formed on at least one side among the inner side surface portion of the internal outer window frame and the inner side surface portion of the external outer window frame; and an internal window frame corrugated coupling portion installed in an opening of the window frame. Therefore, an installation work of the inner window frame is easily performed, and a supporting fore of an inner circumferential surface of the opening of the window frame with respect to the outer window frame is reinforced. |
