The present invention relates to a building outer wall, most of the building having the window parts of the double windows and doors made of air-circulation type of construction for circulating the air within the double windows of the building unit external or internal double-window system.
More specifically, the present invention is provided on the outside of the interior space of the building, and the indoor unit including an indoor fittings support frame for supporting the interior windows and windshield interior; Outdoor windows unit comprises an outdoor support frame that is provided spaced at a predetermined distance outward in the windows portion the inner side, supporting the outdoor window and the outdoor window glass so as to form an air insulation zone with the indoor fittings unit; Air circulator for circulating the air in the air heat-insulating section to the inside of the room to the outside or the building; relates to an air-circulation type of construction dual window system comprising a.