How did you mount your fan to blow across the accelerator? Does it have an opening to the outside to bring air in or just use the air in the case?
I was thinking of doing the same thing on my A3000. I have a CS2 040 there, which has a heatsing and fan. I had to cut a small rectangle where the right floppy sits, for the accelerator to fit.
An easy way would be to install a small fan which would suck air from the right floppy opening in the case, and blow it over the accelerator, and through the back to the PSU.