This one makes me giggle 😃. But it us one a lot of mistakes are made during retro fits. Sizing the remaining chimney correctly seems to be a lost art. FYI 9" still has you covered!!!
I believe the math is correct. They are general rules, referring to the National Fuel Gas Code and section on venting is always recommended. Thank you.
@@vitorao I agree. However in this case I don’t need the full volume with the 50% there is wiggle room. I’m not calculating the volume of chimney, which obviously is very different. It’s close enough for manifolding considering flue pipe isn’t sold in half inches. As mentioned in the video, always refer to the National Fuel gas code for exact allowances of gas fired appliance’s. Thank you.
@@HabeggerHelp, yes, in this case it's close enough. But you could have a case in which the result could be significantly different. Why not do the math correctly?
