NW Aluminum 840 is the slimmest and most thermally efficient aluminum frame of the Generation 4 Folding Glass Walls. With floor supported panels capable of reaching system heights up to 11ˈ 6″ (3500 mm) and panel widths up to 3’ 7” (1100 mm), this folding glass wall offers the possibility of wider opening sizes with the integration of FourFold and SixFold Panel Sets that move and stack to either side of the opening. NW Aluminum 840 for all panel sizes and configurations is Florida statewide approved with Product Approval number FL40273.