PC shop put mb in new case - only 1 fan (air outward) plus PSU (fan outward also) - what's correct air flow?

bizowner1

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Jun 21, 2013
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Should my pc case fan be directing to pulling air INTO the pc case?

My power supply pushes a lot of air outward. So, my thinking is case fan should be pulling air INTO case. Correct? Or does it matter?

The power supply fan is vibrating and making loud noises on startup. I am not happy wiht the local pc shop, and do NOT want to bother driving across town again.

Should I reverse the case fan?