FSU is a Fixed Suction Unit, core of a CVS. The Centralized Vacuum System is a system that can be used to clean lines, floors and installations during or after working cycles, even in non-stop, more in general, is a system suitable to supply, where is necessary, an air flow at certain level of vacuum, for several utilities, even simultaneously, and reach long distances. FSU are also adapt everytime is necessary a suction unit for a fixed intallation, typical other usage are with Dust Cointanaiment Unit (DCU) and with Pneumatic Conveyor System (PCS).