e-fan purchase

so i'm finally getting around to spending money and think i'm going to pick up this e-fan from summit:
http://store.summitracing.com/defau...earchinresults=false&N=0&target=egnsearch.asp

my only question is when i was reading the pdf install link they said something about hooking up a three way connect to the a/c and i don't have my a/c on any more.

i want to feel safe buying this knowing that i understand how to hook it up, and one wanna explain it to me? plus what is the min cfm i should be looking for, this one says 2200, is that enough?

yeah the link isn't going directly to the fan so you'll have to click the flx 175 link

mods: basically stock with flowmasters, k&n fliter and a/c delete