Originally Posted by rsc

More info- mechanical fans can pull up to 11-15k cfm. The two fans listed above pull between 45 and 90 amps and up to 4000 cfm iirc. Electric fans of the same amperage pull roughly the same cfm's, an advertised 15A/3000 cfm fan is probably going to be closer in output to its 15A/2000 cfm competitors. If you live where temps don't exceed 90 you might find that a 2400 cfm fan works for you. Death Valley in July might not be practical with an e-fan.

What sort of info are you looking for? Info on your situation would help a ton.