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I have been using two of these fans in opposite corners of my4x4’s. They have a wind mode that increases and decreases the fan speed randomly. They are tall enough that it provides excellent coverage of the canopy. I have 4 of them that have been running non-stop since late October when i got them. They are not cheap, but they are excellent compared to every other fan i have used. You could get away with just 1, but 2 really makes it swirl. Stop wasting your time on these little slip-on POS fans like i was.

https://www.amazon.com/PELONIS-Oscillating-Control-Settings-15-Hour/dp/B086MFKGJ8/