If you're looking for a powerful industrial cooling fan, because perhaps the area is too large to cool with a portable air conditioner then you need to think carefully about what to buy. Many fans on sale from online shops look powerful, and look big but can only be felt if you're standing right next to them.
The key things to look for are multiple impellers, if it's only got 3 blades, it's going to be a very weak fan, look for at least 5 blades. Look at the wattage of the motor, if it's less than 150W then it's not going to be very powerful.
This video shows you the difference between a good and a bad fan. Both of them look powerful and industrial... Until you turn them on!
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