The 4" x 25' Aluminum Semi-rigid Flexible Dryer Vent Duct from Braxton Harris is designed for efficient venting of dryers and other appliances. This duct features a semi-rigid aluminum construction that allows for easy installation and flexibility in tight spaces. With a diameter of 4 inches and a length of 25 feet, it is suitable for various applications, ensuring optimal airflow and reducing the risk of lint buildup. This duct meets industry standards for safety and performance, making it a reliable choice for both residential and commercial use.