Speakers and a fireplace heat?

So I am thinking of moving my system into another room, but it has a fireplace and I would like to use the fireplace.

This might seem like a dumb question, but I have never considered it and it seems like it would be bad, but how far from the fireplace should speakers be?

I am not speaking of acoustics, but of the heat or long term effects.
So the heat in the room if they are 4-5' from the fireplace won't dry out the cones or anything?
it is room temperature...as if you have any other kind of heat(air,water etc) so if you do not "overcook" the room you should be OK.