With a traditional PSU setup (X-400 vents facing down due to no vents in the top of the case), and a case with a front and a back fan, I wonder if there then would be any positive or negative pressure to give airflow through the PSU. So my question is, what would be the best orientation for the tow...

With a traditional PSU setup (X-400 vents facing down due to no vents in the top of the case), and a case with a front and a back fan, I wonder if there then would be any positive or negative pressure to give airflow through the PSU. So my question is, what would be the best orientation for the towe...