Ceiling fan

A ceiling fan is a mechanical fan, usually electrically powered, suspended from the ceiling of a room, so that it directs the air downward; relatively quiet in operation because of its low speed. It cools effectively by introducing slow movement into the otherwise still, hot air of a room. A ceiling fan can also be used to reduce the stratification of warm air in a room by forcing it down to affect both occupants' sensations and thermostat readings, thereby improving climate control energy efficiency.