What values for excess air can be expected?

Optimum values:

O2m% Excess Air
Natural Gas 3% 16.7%
Light Oil 5% 31%
Coal 8% 62%

NB - Consult the manufacturer's handbook for details of the recommended excess air levels for each particular appliance. This information is supplied in good faith for use by trained professionals after due consideration of any risks involved. Kane International Ltd accepts no responsibility for the application or use of this information.

Always check with the equipment manufacturer and with local regulations before making any adjustments to combustion processes.

If in doubt...ASK!