Does anyone use the Durafan 24' High Performance Fan from QC Supply? I have seen a few around and I was wondering how the air flow/out put is. I know the Sullivan Barn/Turbo are good fans (supposed to be the best), but the Durafan is ALOT cheaper and seems to be advertised as a real similiar fan interms of specs. The only down side is the cage is white instead of black.