It depends a little on the case layout, but traditionally the front fan (down near the bottom) is blowing in. In the back (higer up - remember heat rises) blowing out.
Generally accepted flow is in at the bottom front and out upper back.
Considering the PS will exhaust air, too, I'd make the 1 in front draw air in (blow in) and the 1 in back exhaust (blow out).
Practices vary widely, as do opinions.
This is mine.
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