THE CYCLONE HAS 2 DOORWAYS ABOUT 2' SQUARE & 12"" DOWN FROM TOP ON OPPOSITE SIDES. THE OPERATOR SAW A LOOSE PIECE OF METAL INSIDE THE CYCLONE. HE WAS REACHING INSIDE TO REMOVE THE LOOSE PIECE OF METAL WHEN A CHUNK OF BUILDUP MATERIAL ON THE VERTICAL WALL ABOVE THE DOORWAY FELL HITTING THE EE'S HARDHAT & CAUSED IT TO COME DOWN OVER THE EE'S FACE & HIT HIM BELOW THE NOSE.