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.