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how do I connect round ducts together?

do I need duct tape or self drilling screws


You have a choiceYou can slip-fit them together and space (3) self threading sheet metal screws 120 degrees apartWrap the joint with self-adhering backed, aluminum foiled tapeOr, you can fit together by using a duct connectorThis is usually used for making bends or slight curvesA sturdy joint to secure a duct hanger fromCan secure with screws also but not necessary but wrap with above tapeDuct tape is cheaper and ok but will peel off within a few years.

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