We had the same situation in the facility where now i am working in. We had two big wall exhaust fans from times but I found that little benefited as the problem of powder coating on every inches inside. needed more labor and time to make it neat and cleaning. Wet cleaning of floor and walls needed- although undesirable in fear of microbial growth- was needed on weekly basis while machine clean after processing each product.
After a long time, pressing hard at the top level, finally managed to install HVAC system and I would say the situation is improved 80% better now. As we see, our kind of facility cannot be make 100% dust proof in general way, but I might say, installing HVAC system and compartmentalization of production area would bring real-time improvement