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Cake day: August 5th, 2023

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  • Without pictures, a best answer is not possible.

    I’m going to rely on experience and assume that there is a 90° bend elbow in the wall and the last segment has broken away.

    With the original piece you can open half of the flange and slip the removed piece back in and fold the flange back over.

    If you don’t have the original piece then you can get a “4in flexible duct connector” and slip that in carefully.

    You can also slip the end of the flexible duct into the vent, but you don’t want to bunch it up in the wall, you want the flexible duct to have as smooth a wall as possible.