FineLineTM Corner Welds (standard and laminated units) Galvanized Steel Reinforced Panels and Sill Patented Water Drainage System Multi-Chamber Profiles with Neopor® Insulation Patented Sliding System with Four Adjustable 1” Wheels Per Panel Top-Hung Aluminum Screen Frame with BetterVue® Fiberglass Mesh Proprietary AccuVentTM Allows Multiple Venting Options Perfectly Interlocking Fixed and Mobile Panel Rails