VEKAVARIANT 2.0 is available in three different sizes and offers excellent thermal insulation. The add-on box is not only the ideal addition to all windows from VEKA systems, but is also suitable for connection to window systems from all other well-known manufacturers. VEKAVARIANT 2.0 can be used for any desired opening type and installation situation and also enables the installation of insect screens. In addition, VEKAVARIANT EPS (Grupor and Lehr systems) are special insulation boxes available for the best sound and thermal insulation.