... UV protective layer on the surface.4). 4mm, 6mm or 8mm thickness panels for choosing5). Efficient for ... sliding door, aluminum alloy framework covered by PC sheet, it is very convenient. 4. Base Strong galvanized ... for choosing, HDG(hot dip galvanizing) sheet and powder HDG sheet). 5. VentilationSliding door and two windows ... structure(HX65124G) with aluminium frame, and polycarbonate sheet cover