Fixing into top and bottom U channel
This is the recommended method for mounting panels that are framed or have double folds. It allows for slight imperfections of the structure i.e. surfaces that are not parallel and/or not flat or level.
U-channels are to have internal dimension to accommodate the depth of folded panel; typically 50mm.
U channels are mounted to the top and bottom structure (concrete slab, soffit, timber beam etc.) with appropriate fasteners – masonry anchors, self-tapping screws, etc. The panel gets fitted first into top channel and then pivoted into bottom channel which may have temporary packers fitted at the appropriate height to stop the panel disengaging from top channel.
Once the panel is adjusted to be level and plumb, self-tapping screws are driven into the sides of U channels and panel to permanently fix.
For this method to work, the height of a panel must be that of the opening minus the height of the U channel (50mm typ) minus 15mm.