Go to Wal -mart and by a really small house fan. Mine cost about $5 and plugs directly into the wall. Sorry no picture but I saw them yesterday...they are white, small (the box is about 4" x 4" x 6"). Looks like a small blower and tilts up and down for directional airflow. (sorry best description...I will try and get a picture). It also has high/med/low settings.

Mine has been running for 2 seasons without issue...For $5 why bother with 12v fans and having to convert the voltage and such.

Hope this helps.