I am installing a new wood insert and am planning on putting in a full SS liner in my masonary chimney. My chimney is 6 1/2" x 11" inside diameter. I am planning on putting 1/2" insulating kit on this also. My stove has a 6" flue. It appears this will be too snug of a fit. Would you reccommend going with a 5" or 5.5" liner. Also wondering if they make a reducer form my 6" stove flue down either to 5 or 5.5. Would this be a problem with venting into this smaller liner. My chimney is 24 feet high. Any information and reccommendations would be helpful before I order the liner.