Psu in armor plus case

Hi guys,
First let me start with my build, I have a riiie mobo on which i want to mount a noctua nh-d14. I have a tt armor plus case which has a top mounted psu. I was wondering if I should mount the psu with the fan facing up or down? The case is well ventilated at the top over the psu, i know it would draw dust into the psu, on the other hand, mounting it with the fan facing down would put it right where the nh-d14 is push/pulling air out of the case and maybe that way it might draw hot air from the heatsink.
Please help.
Thank you.
Nadim.

I looked @ that case and it seems to me you would want to mount it with the fan facing down. That case hase plenty of ventolation. What I would be more concerned with is the side the PSU cables
come out. The cables would be easier to route out of the way w the standard PSU mounting. Hope that helps.

Thank you for your reply, it was most helpful