You don't want to push air in from the high pressure spot in front of the windshield because it will probably just fight the radiator fan
The air can only flow one direction and that is out. It actually takes pressure off of the fan if any giving the air continual flow, even when stopped. I mounted my $2.29 chrome vents where I had the most open area and they worked very well as did the others. Our rolling bricks can use all the help they can get to run cooler and more effecient
Nice 10" Fan