Where:
Percent excess oxygen = Percentage of excess oxygen present above the stoichiometric balance of 1.00, (%).
1.00 = Ratio of oxygen in a cupola combustion chamber divided by the stoichiometric quantity of oxygen required to obtain complete combustion of fuel.
Oxygen available = Quantity of oxygen introduced into the cupola combustion zone.
Fuel demand for oxygen = Required quantity of oxygen for stoichiometric combustion of the quantity of fuel present.
40 C.F.R. §63.1178