151 Interior Dehumidifier The 151 Interior Dehumidifier is a compact and efficient solution for improving air quality and reducing dampness in your home. With its special moisture-absorbing crystals, it can effectively draw in excess moisture from the surrounding atmosphere, helping to prevent mold and mildew buildup. Ideal for use in small spaces like cupboards and under sinks, it's also perfect for maintaining a dry environment in caravans and boats, particularly during the winter months.