The fan is attached to the "cover" by 2/3 screws under the sticker,you can see the wires going to the fan.The "cover" is held on by screws or just snaps on/off.
Removing the "cover"/fan will leave you with no cooling
![Roll Eyes](https://bitcointalk.org/Smileys/default/rolleyes.gif)
As said,just add a fan or two,you'll have to experiment with placement of those fans to see where they work best in your situation
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)
Remember to blow out your cards out often,dust & hair & all kinds of crap clog up the heatsink, rather quickly.
I blow my cards out about every 2 months or so,amazing how fast they fill up
![Shocked](https://bitcointalk.org/Smileys/default/shocked.gif)
Edit:some of the non-reference cards (squirell fan on the end is a reference type),like this one,you may have to remove the heatsink assembly to get to the screws that hold the "cover" on.
My XFX6950 was like that
![Sad](https://bitcointalk.org/Smileys/default/sad.gif)