Conventional gasification is defined as the thermal conversion of organic materials at temperature of 1,000 °F - 2,800 °F (540 °C – 1,540 °C), with a limited supply of air or oxygen (sub-stoichiometric atmosphere). This is not combustion and therefore there is no burning. Gasification uses a fraction of the air/oxygen that is generally needed to combust a given material and thus creates a low to medium Btu syn-gas. Although more mature than other processes, it does require complex systems, such as gas clean up equipment.