case venting?

i just got a new idea well not really new but i was looking at my audio reciever next to my pc a noticed the top is completely covered in vents on the top but i have never seen this in pc cases my pc case is kida hot do to my watercooling hc heat (25c-33c) i wonder if that would help what do u guys think?

id like to keep fans to minumium so a top blowhole isnt an option

Yes the vents are there to help convection. I'm considering putting a kind of chimney on top of my next case (zero fan) i'll use a square hole and the lian li V-series back 'cache' (the thing that's placed behind the back 120mm fan) placed over it. Don't put a straight uncovered hole up there or you'll collect dust...