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thanks for the response guys. so about 8 or 9 % would be fine ye ?! and what about PPM

Hi jus currently doing my apprenticeship jus had few questions if anyone could reply: Many Thanks 1) Whats A Atmospheric Burner and a Primatic Burner ? 2) What readings should you get on average on a flue gas analyser ? 3) How come on some cookers when you turn down to low flame it goes out...