Hi to all of you pros!! What do you recomend for going through a sheetrock wall to hook into an existing chimney? Last year we went straight into the chimney. This year we put sheetrock on the wall to make it look nicer. Now we aren't sure what to use to to run into the chimney now that we have sheetrock up. It has a tile or ceramic thimble or liner at the opening is 8". Thanks, Donna