What is Aluminum Flexible Duct? Aluminum flexible duct refers to a type of ducting made from aluminum, a lightweight and corrosion-resistant material. It is specifically designed to create a flexible and durable connection within an HVAC system, such as linking a vent to a duct. Additionally, aluminum ducting is often paired with thermal insulation, eliminating the need for additional thermal protection. While aluminum ducts are convenient, they are less efficient than sheet metal ducts and are not ideal for long-distance air flow. The flexibility of these ducts can create bends that increase air resistance, which can hinder smooth airflow. Therefore, they are best suited for compact solutions and shorter air travel distances.Benefits of Aluminum Flexible Duct: