Golden-Arm, thanks for the post. The fan is inside the shroud about half-way. I have read that many prefer it a little deeper and I could get a small spacer to push it in a little more.

I have a solid fan in now and I will drive it and retest it tomorrow sometime to see if it makes a difference. With the 2" spacer, the solid fan is nearly completely inside the shroud opening. About 1/2" of fan hangs out the back.