Without a completed installation, I am not sure what your issue is. Obviously, you want the air to flow freely through the vent pipe to the roof with no obstructions. In my experience, the flexible duct is installed from the dryer and it connects to the metal duct in the wall. Usually, the flexible duct is attached around the outside of the metal duct and secured with a metal connection collar. The end of the metal duct is usually crimped at the connection end.
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