SIZE & COMPATIBILITY - The 6" sheet metal 45-degree oval Flat duct angle is compatible with duct 6" . Made in the USA, making it perfect for your range hood or ventilation fan APPLICATIONS - The flat transition duct 45-degree elbows are used for changing the vertical direction of the rectangular duct. They are fitting to use when needing to make tight corners and are utilized for maintaining the best airflow for maximum efficiency in your HVAC system PREMIUM QUALITY - We can proudly say our galvanized duct elbow is made of high-quality galvanized sheet metal with crimped ends (snap-lock design) for easy fitting and secure connection PRACTICAL DESIGN - These galvanized or stainless-steel elbows are mechanically bent, resulting in a non-seamed tubing that can be fitted with a rolled-lipped collar or an angle ring flange