[Morris]

And as we increase the speed the air flow increases but the best part is as the air enters the hole in the front it's a one velosity and then the shape of the radiator hole is the air slows down to go thru the radiator at a slower speed and cools much better ....we don't run a Thermostat ....we just use a restrictor that has a 1" hole in it to slow the water flow down....works great....