Dryer booster fans are designed to remove moist air from the dryer, especially in homes where a large amount of ducting is required. The fan control turns the fan on automatically whenever the dryer is running. These inline fans can handle up to 60 feet of ducting with as many as six elbows. The back draft blade design prevents lint from passing through the fan. Ducting accessories are also available from top-brands including FanTech.