Gas Fireplace Thermopile switch and 120v fan switch, same box?

[Scott in MN]

Can I use a double switch box to house the millivolt switch from the thermopile that turns the fireplace on with a 120 volt switch that controls the fan?  Can they be housed in the same box?  Or, becuase they are different voltages do they have to be housed in different boxes? 

I'm running a little short on space, that's why I ask.

[JP]

Without getting too complicated on the subject, different voltages do need to be kept separately, however you should be able to find a double gang box that has a separator in it. If you can find one, that would be your best solution.