i take all your coments on board and i can see where your coming from.
i probably konw more about presure, flow rates, gases, exhausts, monoxide, co2 etc than most boiler engineers, if i can design exhaust manifolds for F3 and world superbikes then im sure i can build a flue.
what i dont know about is the construction and principles of making a flue, i thought it would be available for discussion on this forum.
i understand its not.
i hadnt thought of having anything made compliant, food for thought.
i wont be asking any more questions.
thankyou
ps still no need for sarcastic coments