The ones I normally encounter are usually in a public bathroom, up above the urinals in the men's room, very small but still big enough to take at least a couple fingers off. However, I have seen on occasion, a normal fan, an old one in which the protective grill thing has fallen off but the blades and motor still functioning with the thing blazing away sitting on the floor where a toddler could walk into it. Unfortunately, safety is not first in parts of Asia.