4" inline filter designed to block odors and chemicals from escaping grow tents and hydroponics rooms. Features premium-grade Australian charcoal with greater adsorption and longer life rating. Powder-coated gunmetal finish is constructed for high durability and rust resistance to high-level humidity. Built with aluminum flanges and a galvanized steel mesh; includes two hanging straps and two pre-filters. Duct Opening: 4" | Length: 13" | Airflow Rating: 210 CFM | Carbon: Australian RC412 at 1200+ IAV | Thickness: 38mm Product Description A high-airflow duct filter designed to eliminate odors and chemicals utilizing a premium-grade Australian Virgin charcoal bed. This activated carbon bed has RC412 pore sizes that enable a high adsorption rate and longer life rating. Its heavy-duty construction features aluminum flanges and dual-sided galvanized steel mesh with a rust-resistant gunmetal finish to stand up to corrosion and high humidity. The carbon filter can be used with an inline duct fan for use in int