Hi there! We have a Majestic pre-fab fireplace which is terribly inefficient and gives my husband asthma. I need to figure out if we can install a clean burning insert into this firebox (I know we need to add a liner and extend the hearth), or if we need to take the whole thing out to install any kind of wood stove? I also need recommendations for someone to work with for figuring this out and implementing it. Thanks in advance!