Its pretty powerful but its not too bad. I also converted the power supply to where I have on/off switches for each fan to give me more control over it. Now that I dont live in an apt anymore though I dont really need it anymore. I just paint in my shed now.
Build a bigger one. I built one that will house a 1/8 scale MT body and you can even use some dryer venting to vent the fumes out of a window. :)
In retrospect I will say one of the fans I used moutned rigth in the middle is probably sufficient. 3 of them could inadvertently create a tornado...