Aluminum ductwork is light and incredibly resistant against corrosion. It's perfect for industrial businesses where moisture is common or its interior is open to outdoor seasonal changes. Foam ductwork panels are coated with aluminum to resist moisture and provide a corrosive free system. The coating is dependent upon the application, but it can be eighty micrometers to two hundred micrometers for outdoor applications. Aluminum ductwork is also insulated or non-insulated from the main duct to the outlet system.