OK, so is Ultra Aire a good brand? Seems like everything is junk these days....

If I install one with ductwork in the attic, how much heat is it going to produce running the air through this duct...is that an issue? I know if you spray foam the attic this would be ideal.

If you interlock to AHU blower with the unit, then you will have some more heat gain. If comfort is the goal, how do you overcome these things?