The ThermoFlo™ Elbow is a radius-forming brace for flexible ducts that is engineered to improve airflow and efficiency of your grow room ventilation system. It saves energy by shaping flexible ducts into efficient 90-degree elbows, eliminating kinks and airflow restrictions. By improving airflow, the ThermoFlo Elbow; makes it easier to provide the ideal environmental conditions for your plants, ensuring you get the best results from your grow every time. Made from 100% recycled materials, it works with all kinds of flexible ducting and is UL approved. Easy to use, it can be installed on new ducting or used to retrofit existing flexible ducts.