Agree with that. Both is better if you can. I replaced the power supply in my Super Pac cocktail table with a PC supply. Now the vent behind the old PS is no longer blocked. I was thinking of putting one blowing out through the vent. That way there would be air flowing in from the bottom fan and out through the side. It gets rather warm in there when left on for a long time. For anybody that has vector games, I would recommend a fan in the back door behind the monitor. The Major Havoc (Space Duel cabinet) I used to own had that.