I'm also concerned as the VX450 is mounter upside down adn also that the hot air from the HSF will make the PSU even hotter.
More aboutdoes case good flow
Your case does not have good air flow at all. Can you mount any optional fans?
Can you aim your TRU-90 fan at the rear case fan? That would be a better option.
Here is an example of a case with good air flow.
No. I actually wanted to install it the way you said, but when I pointed it towards the rear, the PSU would be in the way. No room, small case. What can I do as it is to better it? ?And the bottom Drive bay is covered by some plastic design. If I just open up the place up front where you marked the 120mm, will it improve airflow? And my PSU is on top.