Since you work at an A/C shop you could provide some cool facts for us.
Run both the stock fan setup and the Ford Explorer setup for 15 minutes each. Do it back to back so ambient temps are the same. Run the blower on high with the A/C on. Hook up your A/C system gauges and tell us what the high-side pressure is after the 15 minute tests. If the fan is pulling more air and cooling better then the pressure should drop showing that increased cooling.
Couple the pressure differences with a therometer reading stuck in the center duct would be very interesting.
There is a lot more to fans than just blade count. Pitch also plays a big role. It also depends on how far the pitch goes down the blade as the blade approaches the center or if the pitch is variable along the blade. The center is turning slower than the outside which creates turbulence or not depending on the pitch.
More blades and a curved tip are usually to decrease noise and more blades usually require more energy to spin them.