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regardless if we are talking about a vent or a return there should be air flowing in one direction or the other. Put a piece of paper over it and see if it sticks to see if it is a return. If there is no air coming in or out the most likely thing is that it has come apart in the atic. The chances of it getting clogged are pretty slim. If it is apart in the atic you are wasting a lot of money in either return air that is too hot or cooling an unlived in space.
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