most people have both fans as intake so they blow onto the CPU & GPU
frankly i find that side fans actually create more heat unless set to high RPM, since they break up case airflow. I have two intakes up front, one out in the back, and one out up top. MY CPU wont break 40c and my GPU won't break 60c
*edit; your link also has both fans as intake at the bottom of the page labeled "4"