the only two electric fan companies that I found to actually make claimed air flow are Spal and Tri-Pac.
when they say it moves 2500 CFM with a 1.4" restriction core, it actually does.
Spal and Tri-Pac are the choice for most OEM off-road manufacturers when it comes to electric fans.
I couldnt agree more Scott, I installed a 16"
Spal Fan back in 2008 and I live in Las Vegas, were the summertime temps can reach 115+ and even with the stop and go traffic I haven't had any problems.