I'm trying to determine what stove pipe (8") to buy to fix the screw up by the previous owner. I've looked the ceiling box all over and can't find a mfg name or markings on it. I understand I need to know the mfg to order the corresponding pipe. I believe the stove was installed in 2002 by an idiot and I want it right for this winter. I know I should have done it several months ago but at 71 sometimes I just need to be in the mood to do something. My wife saw to it this time. Any help would be greatly appreciated.