So I have had my quadrafire 4100 for about 3 months. Since the first breakin in fires, my glass has been getting excessively dirty. Tech has come out and tried modifying the baffle blanket, then we removed it, but it is still happening. It seems to draft well and at first, it stays clear, but slowly it begins to get covered in soot. It is very frustrating because I cannot watch the fire for long and I must clean the glass after each fire (not an easy task). Any suggestions on what could be wrong or what I can suggest to the tech? They are just as puzzled as I am. Thank you.