I failed Electricity 101.

Radio Shack has a 3.5 inch ac fan which I can just plug into the wall. With the dc fan TCIII suggests, I'd need to use a transfromer/power brick, right? TCIII, is each of your fans on a separate circuit with its own plug?

Beyond the fans, Radio Shack has black project boxes of varying sizes and lighted switches. Several fans strung together and controlled by a clean-looking panel would be a nice thing.