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 Low Noise: Superior balanced centrifugal impeller for long service life & quiet operation; A less than 30 dB noise level does not have any harm and will not disturb your work 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 Premium Material: Made of aluminum, it is resistant to high-temperature and corrosion-resistant, being able to serve for a long time; The stainless steel clamps are rustproof, corrosion-resistant, and heavy-duty, ensuring a seamless junction