I have an Aurora wood burning insert. A chimney sweep came and said that I need a stainless steel liner for my chimney. I can't find the model number of the insert. My current chimney has a clay liner that is an 11" X 11" opening. What size liner can I put in and still be ok?
Your exhaust on the insert, usually on the top of the unit, if it is round, that will be the size liner you need to use. Most newer inserts use a 6" round liner because they are easier to install and will fit in most chimneys. Older units sometimes have an 8" exhaust or an oval or rectangle exhaust opening. Anything in the 50 sq inch range is an 8" round liner. Do not size your insert liner by your existing flue opening, they will be to large, create poor draft and increase creosote. Here is a web address that can answer specific questions you may have about chimneys and flues. rockfordchimneysupply.com