Those ideas seem to be right on track. They key question is whether there is enough grillework to admit roughly the same cfm you are going to exhaust. Rule is like in the HVAC business, air flow in must be same as airflow out and vice versa. You can put a 350 cfm vent hood in your kitchen, but it won't pull better than a small one with all the windows closed unless you have 350 cfm equivalent of make up air somewhere. There has been some opinion expressed that heat is an issue for these units and it would not surprise me. The 300 has a very strange grille area, rear across the top of the cover. No holes over the hard drive area at all. So all my fan does is pull air through the top rear and exhaust out the rear, i.e. no airflow to speak of over the other components. If you look at a Fireball, it has lots of holes center top and even on both sides. I would actually like to buy a 750 cover off a dead unit as at least it has holes over the HD.
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