I'm trying to incorporate controls for my exhaust fan into my control panel but would like more than on/off functionality. A wall mount fan controller would be perfect but i don't think it would fit nicely in my control panel housing ( 16"x16" similar to this http://www.omega.ca/shop/pptsc.asp?ref=SCE_LP&Nav=autk01) I can't seem to find anything that is designed for this application. Any ideas?