Intake or outtake fans? Dell Inspiron 5577

Hi all,

I want to add some extra USB fans to my laptop stand for a gaming performance increase on my Dell Inspiron 5577.  I was just wondering if anyone had some definite information on which fans are intake and which fans were exhaust?  As I want to orient the extra fans so they're blowing in the same direction (and not fighting each other's effects).  I'm aware that most typical computer fans are exhaust, in order to get heat out of the system- however I think I saw something in another forum saying that both fans on the dell 5577 are intake.  

Many thanks for any information