Description Durable: The fan has a strong motor which features a permanently lubricated bearing that operates quietly and requires no maintenance Compact But Efficient: This duct fan is compact and lightweight enough to be installed in areas with little available space; With a diameter of 4 inches, speed of 2930 RPM and 100 CFM air flow Excellent Odor Control: Made of premium RC 412 Australian Virgin charcoal at 1200 IAV, helps to eliminate pungent smells and chemicals; The 38mm thick charcoal bed with high microporosity ensures its high absorption Unique Design: The dual-sided galvanized steel mesh adopt round hole design, which greatly increases the open area and ensures the max. airflow 223 CFM; The lengthened carbon canister enables a higher filtration rate Perfect Connector: This ducting is primarily used with duct fan systems in various air circulation and ventilation projects to move and transport air, increasing airflow and easing connections between spaces; It's compatible with front-mounted and top-loading dryers/fans