Panel System | The flat lock panel system is a hook seam system that is wind resistant. The angled positioning is perfect for any Pure + FreeForm finish as it allows light to reflect at different angles. Flat lock wall paneling systems are suitable for interior or exterior use. Applications include, but are not limited to, facades, soffits, canopies, roofs, screen walls, column covers, and interior walls. Additionally, panels may be micro-perforated and have backing added to transform them into acoustic panels.