@matt Sorry I should have been clearer; it's the fact it's blowing vertically rather than horizontally what surprises me; I'm used to them sucking air in from the front and exhausting it near the back where it gets pushed out by the case fan.
@penguin42 Oh I see. You're referring to the old machine then. Yeah I don't think air flow was quite pinned down back when I built that machine back in 2008. Also I didn't know better back then either.