That's a good point, I guess I don't really know. We see with soldering stations that to really remove the hazard, the ventilation hood must flow very high rate

That's a good point, I guess I don't really know. We see with soldering stations that to really remove the hazard, the ventilation hood must flow very high rates of air and be very close to the work. However flour is not toxic the same way lead is, so maybe general filtration & ventilation would be sufficient.