Electrostatic discharge can be a real problem especially when you are moving
a volume of air with particles in the air stream. These voltages can build up to high
levels that can discharge across sensitive electronics or bearing races. You need to
provide a ground path for these voltages to shunt the voltage to ground. Bonding
all of the components of the system together and making one equipotential plane
and bonding it to a good ground in your shop should provide what you need. Making
all of those component bonds can also add up in cost if you don't have a good source
and have a good way to bond all of the components together.