as with any cooling system HEAT/HOT AIR is better taken away than just pumping in cool air
imagine if nasa room ka na may electric fan tapos umutot ka diba yung baho umiikot lang unlike kung may exhaist fan lalabas yung mabahong amoy
hot air inside any electronic device such as PCs, Laptops and Game Consoles should be expelled so exhaust fans are better, for PS3 meron akong Intercooler Turbo
kasi if you pump out hot air sa likod cool air is sucked in the front, pag nag suck ka lang ng cool air ang tendency umitin lang din if mmas maraming cool air ang pumapasok kesa sa hot air na nilalabas