Joseph S Vanhouten writes:
"I want to let you know that Dave and Andrew go way beyond what is normally called customer service (most places are better know for their ability to be stupid about the products and have a don't give a XXXX attitude)."
These sheet metal take-offs are designed to attach to a flat duct to allow you to connect round ducting to it. They are used to attach your ducting to a supply or return air plenum.