While bathroom fans bring a sense of beauty and style to the room, they achieve more than merely please the eye. A fan mounted in a bathroom can act as a ventilator, circulating fresh wind through the room. After running the shower, switching on the ceiling fan will help the walls dry more promptly, aiding to prevent mold and mildew. In colder seasons, bathroom ceiling fans can be set up to drive warm air downward, which will help to warm a cold bathroom on a snowy winter morning.