I already have a Brunco fireplace insert from a friend, but I need a freestanding wood stove. I got on Brunco website and the 2 types are similarly constructed, but vent pipe is rectangular and out the top of the stove. If I can adapt a vent pipe to vent properly using my existing chimney, can I use this insert as a freestanding unit? Since it is an insert it has no legs. Any help here?