Also, if you heat your basement, I don't understand why you are sealing the gaps when you have a vent coming out the side of the ductwork. To keep the same basement temp you will need to open the vent more to compensate for the loss of gaps. If you don't heat your basement, you should also look into covering the vent, not just closing it off, and insulating the ducts and ceiling down there. Just be careful if you start insulating things that you don't wind up with it getting so cold that water pipes would burst.
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