FDC is a Fixed Dust Collector and is the filtering stage in a CVS. The Centralized Vacuum System can be used to clean lines, floors and installations during or after working cycles, even continuously; more in general, it is a system able to supply, when necessary, an air flow at certain level of vacuum, for several utilities, even simultaneously, and reach long distances. FDC are also suitable everytime a centralized collection point for a fixed intallation is necessary.