maintaining a temperature of 2000F(1090C)in the combustion chamber requires about 100%excess air. o Temperature drops if the unit is operated in the starved air mode o The air blown into the combustion chamber above the refuse is logically overfire air,provides O2 for combustion as well as to enhance the turbulence in the combustion chamber. UNEP maintaining a temperature of 2000ºF (1090ºC) in the combustion chamber requires about 100% excess air.  Temperature drops if the unit is operated in the starved air mode  The air blown into the combustion chamber above the refuse is logically overfire air, provides O2 for combustion as well as to enhance the turbulence in the combustion chamber