MILLIARD 25&rsquo; Aluminum Foil Duct Multi-purpose. Use it with any 6 fitted air duct system. Great for home & garden use. Flexible and durable. Designed for use in the MILLIARD Hydroponic Grow Tent with the MILLIARD Inline Carbon Filter and MILLIARD 6 Inline Blower Fan. 25 long for extending airflow to remote areas. Resists punctures and tears, yet remains flexible for maneuverability.