The construction of standard door leaves for both door models is made of fixed frames in 40 mm or 20 mm steel profiles, that give the door a self-supporting structure. The sliding door leaves are made of extruded profiles in aluminium alloy measuring 30 mm standard. The top of the Lowered Arch, unlike Rondina, which has already been built by a concealed cover, is formed by a single curved box containing the automation 320 mm deep. However it is possible to insert an optional conceal cover and eventual spotlights, depending on the needs and on the covering radius of the door. For a correct installation the upper part of the hat structure must be anchored to the building or to a supporting substructure, especially made according to our technical indications. Indisy sealing system completes the finish and ensures a good air tightness of the door. Each door is assembled and tested at the factory before being installed. Technical experts install and test the doors. The care and maintenance after-sale throughout the national territory are coordinated by Ponzi Operating Service Centre.