Question Should a PSU fan be exhaust or intake ?

TechBloke

Distinguished
Jan 1, 2016
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Hi all. I have a HP Elitedesk 800 G1 tower pc and the PSU fan was covered in dust. Removed and cleaned fine. Put back in all good. Except I have it in the intake direction and cannot recall if this should be exhaust! Please confirm the correct orientation...many thanks!