I'm continuing to modify my cabinet to keep all the AV cool. My Ps4 sits in a space about 30cm square. There is a door that can be opened but in a perfect world I'd like to run with it closed. I've installed 2 x 120mm fans, currently set to extract the air from the back of the unit. I then leave the door open to let air in. I can either fit an additional fan/grill to get the air in (hidden on the side) or set one fan as intake and one as extract. I can measure the temperature but I'm unsure how cool it needs to be, as it does kick out ALOT of heat! Pictures are in my sig below (page 2 I think).