PC case fans air flow

I have an ATX case that has a 120 mm mounted in the back blowing air in, a 40 mm fan on the side blowing air in and a 40 mm top fan blowing the air out. It's an older case and have no room for more fans. Just wondering if this is the optimal air flow for my case. So the back and side are intake, and the top is pushing it out. Any suggestions are appreciated.

PC Specs:
I5 3570k (Stock cooling)
ASROCK|Z77 EXTREME4 Z77
Evga 660 SC
8 gig g skill 1600 ram
Kingston HyperX 120 gig SSD

[quote name='UnicornBang']I have an ATX case that has a 120 mm mounted in the back blowing air in, a 40 mm fan on the side blowing air in and a 40 mm top fan blowing the air out. It's an older case and have no room for more fans. Just wondering if this is the optimal air flow for my case. So the back and side are intake, and the top is pushing it out. Any suggestions are appreciated.

PC Specs:
I5 3570k (Stock cooling)
ASROCK|Z77 EXTREME4 Z77
Evga 660 SC
8 gig g skill 1600 ram
Kingston HyperX 120 gig SSD[/QUOTE]

Top and rear under normal circumstances should be blowing out