My friend just purchased a small home(790sq. ft.). The only source of heat is a little freestanding gas stove. When it runs, which is most of the time right now, it seems to do a decent job of heating this little house. The only question I have (and my friend) is the fan seems to run non stop. Not sure if that is normal or not. There is a switch at the back of the unit that we have turned off and on but it doesn't seem to have anything to do with the fan. We also can't find anything on it to tell us the name of it. So, is it normal for this fan to run all the time?