Hi, new member here, referred by a friend. OK, so here is the problem, I have an older England 24-jc wood fireplace insert, bought new in 1992 and installed into my fireplace per the instructions, no flue pipe connection, i only burn 2 cords of wood in January and February, stove always worked well with no problems then i started hearing that set up (stuffer) wasn't code any more, so i pulled it out, cleaned every thing, replaced the cat and was going to install a chimney liner, now the connection on top of the stove is 8'' and i'm being told that i cant reduce to 6'' even though the cat is 6'' and all of the newer same size stoves are 6'', am i going to have to use an 8'' liner. Thank you for any help you can give.