The amount of combustion air supplied to the fire that exceeds the theoretical air requirement to give complete combustion.
The percentage of air in the heater in excess of the theoretical (stochiometric) amount required for combustion.
The amount of air provided in addition to theoretical air, to achieve complete combustion of a fuel, thereby preventing the formation of dangerous products of combustion. EXHAUST AIR. Air removed from a space and not reused.
The amount of air needed by a burner which is in excess of the amount required for perfect or stoichiometric combustion. Some amount of excess air, depending on the available fuel/air mixing energy, is required to assure through mixing of the fuel and air for complete combustion.
Air in excess of the amount necessary to combust all the available fuel.