On Mon, 9 Sep 2013 09:01:03 +0200, nestork
wrote:




That might be the reason why you often see really tall chimneys rising
10 to 12 feet above the roofs of houses. Perhaps they needed that
height because the heating boiler is located on the opposite side of the
house's basement from the chimney. I always wondered why any builder
would extend the chimney so far above the roof line, and that's one
possible explanation.

The chimney must be a given height above the peak of the roof or
anything inside a particular distance away. I forget the exact
formula, but there is one to determine minimum height.