OP,
If you're talking about a standard floor fan or table fan, then what you need is an AC Motor Controller. I'm not sure if a control designed for ceiling fans will work with those other devices. They used to have Triac based motor controls that worked with things like power tools, but I wouldn't know where to find one now - perhaps the tool dept at Sears or one of the big home stores like Lowes or Home Depot. Not sure if they'd work with the type of motor that is in floor/table fans either. Perhaps the store might have a display model that you could try on your fan right there. IAC, I'm sure it wouldn't burn up your fan - either work or not work.
.bh.
.bh.