Hi everyone, wondering if u could advise me. Just added 2 cooling fans to my custom case. My qustion is the side of my case has a fan that is definately an exhaust but I think (judging by the dust building up in my PC, side of case is an illuminated viewing window!), that my new fans are installed as intake, how do I tell which way round they should go?. That said also, what is more efficient intake or exhaust?, or a mixture to ensure a steady airflow. I have five fans, one for the PSU, two on the back of the case, one on the transparent side of the case and the CPU cooler. I have noticed that since the installation the 2 rear fans has meant that the airflow from the exhaust has become infinately cooler but I would be grateful for any advice from you budding experts, cheers in advance.