Just off the top of my head (since I don't feel like going in the other room and digging out my manual), I wonder if the trigger output would be enough to gate an SCR.

If you want to get inventive, you could even get a small PLC and use the trigger as a discrete input. Then you could have the fan hooked up as a discrete output. Maybe an Allen-Bradley Micro Logix controller (even cheaper than a PLC).

Of course, someone probably has a simpler solution. I'll look up the specs tomorrow, I may even be able to find a relay with a coil rating low enough to operate off the trigger...