Not sure if anyone mentioned this, but I use a PC fan from Radio Shack, the material they come in now is really lightweight and can be hung from the ridgeline but fishing line and a clip.
Just take the fan power and connect it to a 9 volt clip, hang from ridgeline, plug in a battery and your good to go. If your even more inclined you can add a knob to regulate the voltage and control the speed of the fan.
Light weight, durable and easy to manage
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