Well I've written this two times now. I have a wood burning stove that I don't use for wood burning I use Crisco candles inside of it and allow it to heat up like a radiator to keep me warm in an RV. My budget so tight that sometimes I have to use wicks that are smoke and I encountered a problem the other day with the smoke that was really bad. I want to pipe this out the window but I'm finding that the flu size on this stove is 5 1/2 in and I'm only finding 5-in pipes and 6-in pipes what do I need to use a 5-in or 6 in to put their on the flu and pipe it out the window