O.K. I have a newer Heatilator fireplace with a 25 foot air cooled metal chimney in a wood exterior chase. I'm thinking about maybe tearing it out. The chimney is fully enclosed with no access from the house or attic. What's the best way to accomplish this? I would most likely remove the fireplace from the back because I have stone in front but how does the chimney come out? I'm not sure how it's supported but it looks like the weight of it is on top of the unit. Do I try to pull it out the top or do I push out the fireplace and try to deal with the pipe if it falls down? How about the re-install. How do I get the chimney back up the chase without tearing apart the chase? Thoughts?