Electric Fan, Single, 12 in. Diameter, Reversible, 880 cfm, Black, Plastic, Each.  Sure, Derale Cooling Products Tornado electric cooling fans use a swept-wing blade to increase cooling efficiency, but that's not the only reason they'll boost your car's performance. Their unique design means that they can be used in pusher or puller fashion, and the special outer ring that links the blades effectively eliminates vibration. All of that means less of an amperage draw on your engine and more available horsepower. In addition, by replacing your engine's belt-driven fan with a Tornado, you'll also reduce fuel consumption.