Hardware for windows and doors with folding sashes of Harmonica-type is a specific and non-standard mechanism that allows the execution of elements with a large pass-through area in the open position and an extremely light and silent movement of the sashes. The production of “harmonica” can be made of aluminium or PVC joinery.
“Harmonics” are preferred for covering large openings, such as exhibitions, in restaurants, entertainment areas and terraces where there are requirements for a maximum area of passing. The sashes of the “harmonica” portal fold to one or both ends of the frame by means of special rails and wheels, providing almost 100% open and free area.
