I would like to make sure my newly installed dust collection setup is grounded to prevent static build up. I'm not concerned about the possibility of fires in the ductwork but the annoying shock that might occur. All of the ducts are metal with flexible hose at the machine connections. Is it necessary to maintain continuity from the metal duct to the machine through the steel reinforcement in the hose? If so, does that also apply to the flexible hose at the dust bin? And finally, should there be a grounding rod or connection to ground made for the system?