I found a 40 mm fan in an old external cd burner and decided to throw that in the empeg. I didn't want to use benjammin's temp control board, because I didn't feel confident enough to soder to the empeg's board and i also didn't want to wait for one. So I decided to put a switch on the front of the empeg, to control the fan. I wanted to use a push button switch, so it would be more discrete, but i couldn't find one small enough, so I had to use a toggle switch, that took the looks of the empeg down. Pic attached.