I have an opportunity to get a wood pellet stove insert at a real good price (real good). My house already has a zero clearance fireplace that I rarely have used...its a piece of junk and it doesn't heat well. Here's my problem...the dimensions of the existing zero clearance fire place are not big enough to accommodate the pellet insert (stove needs 23" wide 11" deep and 21.5" high - existing firebox is only 19" high, width and depth are ok). Can I remove the old zero clearance fire place and install the pellet insert in the area where the fire place was? Would I have to install some kind of shielding? Or build some kind of fire proof housing area? Are the inserts designed specifically to work within an existing fire box and would I be reducing the efficiency of the stove? Could I somehow make it work without burning my house down (lol)? I'm not at all attached to the zero clearance fire place, I can't foresee ever wanting to revert back to using it so if it can be taken out to make the insert work I don't mind. I just don't know much about stoves and how they work. My floor space is limited so a free standing stove is not a very appealing option, besides I have this particular deal on this insert that I have to act on reasonably soon. Anybody have any advice?