Fitting 2 120mm case fans

Generally I'd put lower down fans as intake, but try and balance intake and exhaust to create flows of air... don't have all your fans as intake or exhaust as it'll defeat the point.
 
I would go for intake on both fans for sure and would dust filter them if your case does not have that feature. Also make sure your case fans at the top and top back are all pushing out
 
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And have them set to intake, think about how hot air rises, the cooler air in your house will be nearest the floor, also once inside your case will push the hot air up.
 
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