As Keefelane66 posted, those are not return vents. They are to balance the air between areas that might be closed off such as a bedroom if you shut the door and the rest of the house. We have a yearly maintenance contract on our A/C and I asked the guy one visit why we had two vents in our bedrooms. He said he ran across a house that did not have them and the people's bedroom got very warm if they shut the door. He installed the balancing vent and the problem was solved. Cool air can't get in if the warm air can't get out.
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