(FIG.8), and flanges52that rest on flanges54B. Screws56fasten flanges52to the flanges. In one preferred embodiment, as shown inFIG. 8, recessed channels48form a trapezoidal shaped depression in panel main body portion39and include opposing sides defining an angle of approximately 45 degrees...
In one preferred embodiment, as shown in FIG. 8, recessed channels 48 form a trapezoidal shaped depression in panel main body portion 39 and include opposing sides defining an angle of approximately 45 degrees with respect to a plane defined by an interior facing surface of the panel. Flanges...