Don't know if this the correct forum but here goes. I have a full tower case with 3 fan openings @ 80mm. The P/S has a single 120mm fan that pulls air into the case. There is one above the p/s about 2-3 inches above and one below about the same distance. There is one bottom front that pulls air in. Unsure of which direction the ones above & below the p/s should go. Pull or push?