The material prefilter blocks of the particles, effectively preventing the from being clogged. Made of Australian charcoal, one of most absorbent carbons available, offering powerful filtered airflow. According to scientific calculations, the optimal shape of each particle is designed. Features - Color: Silver. - Material: Galvanized plate. - Reversible flange and base for longer life. Long screw port design makes it easier. - The special design makes it have higher absorption performance for air pollutants, including the smell of indoor planting tents, kitchen fumes, pet , cigarettes, and other chemical irritants. - The item can be used as an air intake or exhaust for various settings, suitable for indoor planting tents, bathrooms, basements, and kitchens. - It is a must-have air quality butler for your home. Needs to be used with straight exhaust fans and ducts. - Adopts precision production to stable characteristics and high reliability. Package list: 1 x Air