Originally Posted by joecaption
Why not go with a ridge vent instead. No power needed, no noise, noting to break down, will give you far more air movement.
I have ridge vents and full soffit vents on my roof, front and back. The original ridge vent was perforated metal; the replacement (with re-roofing) was Cobra type. The soffits are perforated metal. All of them are open.
With either vent, I have never been able to demonstrate ANY airflow either into the soffit or out of the ridge. On a summer day, it's hotter than hell up there.