more exhaust than intake is a pretty good airflow pattern IMO. It leads to less turbulence within the case. If you flip your cpu fan over to suck off of the socket, you can just blow the hot air directly out of the side panel as the case comes with a cpu air duct. The other side panel vent holes would be very advantageous for people who own the Zalman ZM80 graphics card cooler, or perhaps even any of the GPU coolers. If you are afraid of dust, just go to home depot, and buy a 15"x9" piece of air conditioner replacement dust filter for 99 cents. Cut it up, and attach it to the parts of the case that you notice dust coming through.