We have some where around 750. We also have had problems with the grills but we have fixed that. We have changed about 75 so we can daisy chain them. We have found them to be the best fan for us out on the road. Easy to stack, stay in place and VERY hard to break.
The best fan at home is their Force 9, daisy chain, 2 speeds, and quite.
We sometimes look at things different than others because we are on the road so much.