Derale 16910 Dyno Cool Performance Electric Review

This is a fan and it works perfectly. I can't say for sure that it moves the claimed CFM, but it moves air at a good rate and seems to be excellent at cooling my engine. I will say that the blades get smoother as they move away from the center. I think this is to ensure that an even amount of air is transported over all distances. However, this seems like a waste of time to me as you have to use the higher speed on the ends of the blades rather than discarding them by flattening them out…