any fans in any system push out air . thats the job of fans and its the basic rule i think
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Are the Sony fans pulling the air in to the PS3 or pushing it out?? I was going to replace the 15 blade fan with the 19 blade version.
19 Blades Internal Metal Cooling Fan for Sony PS3 Parts | eBay
And maybe an external usb fan as well.
USB Cooling 4 Fan cooler For Sony Playstation 3 PS3 | eBay
here if your using a fat ps3 the air intake is in the front and on the side is Exhaust and in the back here look at this vid im in the middle of doing this mod myself