Let the volumetric fractions of gaseous fuel and dry flue gases be known.
Let V = volume of flue gases formed in m3 per m3 of fuel when air supplied is just sufficient for complete combustion.
V1 = volume of excess air supplied in m3 per m3 of fuel gas.
Total volume of dry flue gases formed per m3 of gaseous fuel = V + V1
Volume of excess air in flue gases per m3 of flue gas 
m3 of air/m3 burned gases.
Let O = quantity of O2 in m3/m3 of exhaust gas
Then air in the exhaust gas = 
m3 of air/m3 of flue gases
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