So I have this open grill area on the back of my case, Bitfenix ghost. It doesn't really serve a purpose as far as I can tell. To create better positive pressure, should this be sealed off? Also there is room around the fans, I have 120mm fans and it can use either 120s or 140s, so with the 120's there is a bit of room around them as well? you can see it the rear photograph between the upper fan and the psu opening on the right http://www.bitfenix.com/global/en/products/chassis/ghost#gallery