The fans used on Airchamber systems move fresh air through on a constant basis. This prevents the buildup of stagnant air and condensation from temperature changes. They do not remove humidity, however, humidity is not a bad thing as long as it’s in the air. That means it is not in your car. Humidity helps to preserve the natural properties of leather, wood, rubber, and other materials used in classic and modern cars. Dehumidifiers are not generally necessary with Airchamber systems.