Teardrops n Tiny Travel Trailers

I want to put a speed control on the fan I have in my roof vent ,it only turns on or off.
Will a dimmer switch for a 110 volt light work like you buy at Lowes?
I am guessing it does but didn't want to buy one and find out different>?
I haven't done much 12 volt wireing other than hooking up a stereo?

Check out Ebay, there's a million of em

http://cgi.ebay.com/DC-12V-8A-LED-light-Bulb-Dimmer-Brightness-Controller-/380232252980?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item58879bbe34#ht_1903wt_912