I operated the dryers at a coal mine in the 1980s. We had to start the exhaust fans with the dampers closed and then slowly open them, or we'd take out the powe

I operated the dryers at a coal mine in the 1980s. We had to start the exhaust fans with the dampers closed and then slowly open them, or we'd take out the power for all of Northeastern British Columbia. I know because I knocked the power out by mistake one night. I suspect that high-drawing factories must employ similar strategies to slowly increase the draw.