So I've decided against sticking an insert into my Heatilator and would rather rip out the old ZC and have a small free standing stove installed. The chase is build off an exterior wall and is completely outside, not counting chase in the attic which the chimney is visible . Looking at the old heatilator manual, it shows the Zc framed from 42". The small stoves I am looking at are the Regency CS1200 or the Kuma Aspen, both alcove approved. I want to rip out the zc but I'm not sure how far apart the framing is . Since the chase is exterior, can the framing be changed so I can get the needed 50" width I need for the alcove for the regency? The blue tape on the crappy tile is the 48" I need for width for the Aspen. Thinking is should be no more than reframing out to a larger opening and moving the header up towards the ceiling? 84" is needed for ceiling height, I have 8 foot (96" ceiling). Anything else about the alcove to think about? It will be professionally installed. I'm ok with the stove face coming out of the alcove a little bit too. I'm hoping the door will be flush with the existing walls if possible. Picture attached of what I'm dealing with. Is it pretty easy to remove the old ZC fireplace? I'm pretty handy so that could save me $500 just to rip it out myself. Also would it be overkill to use type A chimney for the whole run? What about black double wall pipe in the alcove and then type a from the ceiling out? I am getting that right?