I finally got around to getting another computer fan for in my window. I have an Antec Big Boy 200mm fan in my vent and love it, but sometimes I want more air either in or out my windows too.

So I got a second fan and put it on a 12v extension cord. I have 12 volt plug-ins at both ends of my trailer, so I can hang it just about anywhere that I want more air movement. The fan is about 8 inches in dia.
Here is the Amazon listing for the fan.
http://www.amazon.com/gp/product/B000V6 ... UTF8&psc=1It is three speed, uses little power, and is very very quiet. It moves a good amount of air, 134cfm on high at 0.3amps and 30dBA.
I put it on a chain so that it would be easy to hang, and also easy to just turn around, depending on whether I want to move air in or out the window. It is also quick to remove and put away for traveling.
I added a small inline single pole switch that I picked up at Radio Shack for an on/off.
Hanging: (I don't know why resizing my picture should make the window screen look like Medieval chain-mail but it does. Weird!)

Cord, Switch, and speed control
