If they're not pulling at least 3,000 cfm they're not gonna cut it. Guys buy fancy, expensive electric fans all the time without knowing what they actually flow. Just like a mechanical fan the electric fans benefit from a good shroud, which many aftermarket electric fans don't come with but are often part of how they're rated at their maximum cfm. The Ford Contour fans I use are rated at 3,500+ cfm on the low speed and over 5,000 cfm on the high speed. They come with a built in shroud that was designed for them. Just buying an expensive aftermarket electric fan doesn't guarantee anything, some are only capable of 1,000 cfm. Even two of those won't even begin to work as a standalone replacement for a mechanical fan.
