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I used two of the fans to move warm air upstairs.. I put the two fans in the wall where I have duct work from the basement to the upstairs. I know the fans can move air because when I first installed them drywall dust came out of the opening in the wall. I have had them on continue out for two weeks now. The only problem I had was finding a converter going from 120 volt ac to 12 volt - 650ma dc.