Well I'm feeling a bit left out in the hotly contested post. so th stirr up the pot lets start the cat vs non cat debate. Hell its been over a week since the last one What no takers? What about the outside air debate? so that is of no interest either dam I got to gets thangs going here Did you know smoke spirals in its accent up a chimney with each spiral motion, it builds up speed to its final exit that being true circular fllues are better than oval or rectangular masonry ones. Which way should corrugated chimney liners be inclined in the northern hemosphere?