Is it dangerous to use a rheostat with a fan?

Because rheostats suck for controlling motor speed. They screw with the voltage. Spin ups can cause big thermal loads and low electrical permeability. On motor loads you use a VFD. Variable frequency drive. Just get a proper switch meant for a ceiling fan. Hunter makes a whole bunch of 'em. So does Lutron. They are pots with a capacitor series for low RPM spin up. Don't get me wrong, they still suck balls, but they work and won't catch on fire. They are just cheap as hell and will eventually blow. Buy two...or three. Rheostats and potentiometers will work, but they blow chunks and can burn your stuff up. Literally.

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I have to vent some more about this stuff because I'm angry about it too. I've had these damn pots go out on me all the time and they aren't cheap. It's like a 20 dollar switch. Looks nice, works great...for a while. Then they all arc out and destroy the cap. Why can't they come out with a nice VFD for single phase? I can buy one, but hell, it's like 800 bucks!! And most single phase motor loads won't run on it! Sorry, I'm just angry.

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RE:

Is it dangerous to use a rheostat with a fan?

I have a standard 110V AC box fan which has a low speed of gale-force. I'd like to use a plug-in lamp rheostat to tame it a bit. Rheostat instructions generally say not to use them with motors. I used one with a ceiling fan back in the 80s with no apparent problems. I'm older and wiser now...

You can buy a small motor speed control that will work just fine for your box fan. No don't use a lamp dimmer switch it will not work correctly with your fan and can burn it up. Using a rheostat by itself to decrease the voltage also will not work. Try something like this:

http://www.amazon.com/The-Speedster-Fan-Speed-Cont...

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