Will putting a vent over a video cards fan cool it down significantly?

i have a htpc and i just got a new video card for it. But the where the video card is it is really close to the top of my case. If i drilled some small holes above the video cards fan to make a grill/vent for it would it cool it down better?|||Try getting a new tower/case you know. The are those "cool" and "fancy" ones but they are costly but you can get well designed ones at a very low rate! (^ - ^)|||Possibly, small holes wouldn't make a difference. However if you could cut a hole the size of the fan or bigger it would breath much better.