My fan spins louder when i open my side panel?

ok this is really weird. not really a problem but idk why this happens. when my case is closed (raidmax smilodon extreme black edition case) the fans spin normaly. when i open the clear side panel they speed up a ridiculous amount. why?
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More about spins louder open side panel
  1. Hi :)

    One of two reasons...

    1, Its an audible illusion...

    2, Changed the airflow characteristics of the case...

    All the best Brett :)
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