hi everyone, I moved into a new home that has a wood fireplace. I would like to have a wood insert installed. the local company that came out said that I didnt have enough space to do a insert. after they left I started to look closer in the fire box. it appears that there is a prefab brick wall/ barrier that sounds hollow behind it. my question is, would it be possible for me to remove that to gain a little extra space. it is definitely not structural. thanks!