I'm looking for a low profile fan that will pull more cfm than the Spal 400 and my search led me to the Fan Man's web site. He has a spiral-blade fan called the Sidewinder that he claims pulls 2200 cfm and is only 1 7/8" thick. This is accomplished by setting the motor out at the edge of the fan with some sort of drive mechanism turning the blades. It is listed as a kit but at $420 and no mention of what's in the kit I'm a little sceptical. Has anyone on the forum had any experience with the Sidewinder? Thanks.