Since the workshop is a former reservoir with only the garage door opening for ventilation, I am installing an exhaust fan by repurposing the original manhole opening in the ceiling. The unit is a 5,000 CFM industrial fan, which should recirculate the air in the shop every 8 minutes. We are running power down to a switch at ground level to activate the fan only when I am in the shop.
Once this is complete, I will look to add an industrial-sized dehumidifier unit as well but still need to work out where to expell the water.