On Jan 17, 9:26�am, "S. Barker" wrote:
It is possible to create too much draft. �But going up just one pipe size
won' t do that. �I have a fireplace insert with an 8 inch outlet and my
chimney is 12 inches square. �Sometimes when i open the stove doors, �it
just goes ape! �Also the smaller pipe will stay cleaner due to it's running
hotter.


the effective size of a square or rectangular chimney is the largest
circle that can fit inside, so your 12 inch square isnt as oversized
as you might bellieve