I'm due to receive my HAF 922 case tomorrow (can't wait!) and I have a question about the fans on the case, specifically the two in the upper corner of the case, one blowing out the rear, one blowing out the top. I use a Titan Fenrir heatsink and the fan on this will blow air through the heat sink upwards and to the top of the case. This makes me think the other fan blowing air out the rear is largely redundant. Do people usually not use one of the fans depending on the orientation of their heat sink?