A full range of low emission burners from 1,000,000 Btu/h to 63,000,000 Btu/h 369 kw to 18,459 kw IC burners feature: Induced FGR (Flue Gas Recirculation) system, with modulating FGR valve. Guaranteed to operate at < 30 ppm NOx, corrected at 3% O2, and < 50 ppm CO, throughout the firing range, when firing natural gas.