The 14100 series has curved lines both at its inner and outer sides. These are thermal-insulating frames with double glass panels and three sealing rubber gaskets. It is equipped with German security devices, which lock the frame perimetrically in up to 12 points. They are available in many types and configurations, single-panel, doublepanel, fixed, Volkswagen type, etc., and in many electrostatically painted colors: Ral, Polydrox, wood color.