Joseph Meehan wrote:

All the air that does go through the system is "sucked" up through the
soffit vents. Where else do you think it is going to come from???
AND out the ridge vents, which you must have for all the reasons mentioned.

One thing that can also bit people in the butt is that when venting
moist
warm air vertically, you increase the chance of condensation flowing
back
in from the vent.
In winter especially the relative humidity of the vented air drops
dramatically. Even in summer with humid outside air, if it isn't
raining in your attic, the fan exhause won't start it.

Lots of insulation would be advisable. (not sure
if your in
a warm climate or cold)
That I can generally agree with.
I disagree. Insulation does not add heat. It is a barrier that
prevents heat flow. Your insulation layer is what divides "inside" from
"outside". Your attic should be outside so the insulation must be
on/under the attic floor. That insulation will not affect far exhaust
into the attic.