L-6534VW Operation Guide Safety Instructions and Notes on Usage 9 Warning Never place your hand or body near the roller while it is operating. Hands, hair, clothes, and so on may be caught in the roller. Connect the exhaust vent for the corona treater to equipment that vents outdoors. When ozone reaches a specific density it generates an odor, and if the density continues to increase it can be harmful to the body. If you notice a smell of ozone, ventilate the area immediately. Also, make sure that exhaust is venting outdoors correctly.