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Help with fan direction in a portable mame cabinet/control panel

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vrf:
It's not a very good airflow setup to have both your intake and exhaust right next to each other. You need cool air moving across the entire case, and especially the CPU area. So... cool air in on one side, hot air out the other.



In your situation, I'd have some several small intake vents (covered with mesh) in the front (or bottom front) of your box, and have BOTH back holes with a fan blowing out.

Necro:
I have to agree with VRF.

Although, depending on your setup just having two rear fans blowing in might bring down the temp enough that it wont matter.  A big part of the heat in the case would be the overall airspace available.

If you want all things on the rear, and want to do both in and out, your best bet would be to have the intake at the bottom, and the exhaust higher up.  Since hot air rises, it would result in better exhaust of hotter air, and the cooler air would hit your components directly.

and you could put in a baffle type thing (board) above the PC components and intake, forcing the air to take a path past the PC, and around to the exhaust.  Although now your just going overboard.

As for dust, put a few mesh filters over your fans and clean them every 2-3 weeks.  It'll keep dust to a minimum inside...though it won't make it perfect.  If you just do exhausts, your going to get dust also because you create negative pressure inside the case/cab and it will suck air in from wherever there's a gap in the case - and with it dust. :)

PetitMorte:
This is how you want your heat to go..



The way cabs and vents are set up, is like a chimney for heat.  This is why the old cabs didn't have fans.

kelemvor:
It the fans are on opposite sides of the cabinet, or one is at the bottom and the other is at the top, then you should have one goig each way to help with the circulation.  However the one blowing IN should be blowing directly onto the moutherboard and such to keep it cool.

However if both are near each other, than I would have them both blowing in (and still directly on the MB) as long as there is another vent somewhere that the air could then go out.

And like Petit said, heat rises.  So you could just have an opening up at the top and a single (or even no) fan in the bottom and the heat would rise up by itself and your fan would just be giving it some help.  But by blowing directly on the stuff thta's getting hot, it will help to cool it faster.

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