Fans are machines that blow air or other gases in large spaces or rooms. Fans don't just move air into a space, they can also take air out. They find extensive application the enormous amounts of air required for the ventilation and air-conditioning systems of large buildings and for the ventilation systems of mines.In most ventilated buildings the air inside is changed by fans from one to three times an hour!!
The fan is such an old invention that no one knows where it came from. Chinese legends say that the fan was invented in China almost 5,000 years ago. Chinese fans were made from many different materials. Some were stiffened pieces of paper or silk with a handle. They were usually beautifully painted, often by important artists.Fans are devices that move air. The moving air makes a person feel cooler. Fans range from delicate objects held in the hand to large electrical machines.