About this item Designed to eliminate odors and chemicals for grow tents and hydroponics rooms. Features premium-grade Australian charcoal with greater adsorption and a longer life rating. Extra-large size contains larger carbon bed for longer lifespan while maximizing airflow passthrough. Includes two prefilter cloths and two rope hangers; built with aluminum flanges and stainless-steel meshing. Duct Opening: 4” | Length: 16″ | Airflow Rating: 300 CFM | Carbon: Australian RC412 at 1200 IAV | Thickness: 38mm