That's a big fan! I assume you wore some kind of respirator while you were doing it?My shop gets covered in dust. Last weekend I opened the back door, put a big (4 foot diameter) fan in it and fired up the leaf blower. It's amazing how much dust you can stir up with a leaf blower. I got a lot of it out of my shop though.
I definitely had a respirator on. I've gotten where I can't hardly go into the shop without one. Sinuses clog up almost immediately. I've been working with cocobola lately and man that stuff is rough.