Another chimney I built (I've built seven in my time!) defied all the rules ...I decided to light a fire in it to see if it would draw. It did - beautifully - mind you I had made the inside of the stack awfully wide to encourage the smoke to get away. ...the arrival of an architect on some piece of business or other. "While you are here I must show you something. See the height of that chimney? See the ridge of the roof? Well the chimney draws beautifully!" "You can't tell me!" he said. I never did like that man.