In Downdraft Gasifier System, the controlled intake of air (oxygen) is fed into the chamber containing downward movement of biomass material. After going through the process, the producer (inflammable) fuel gas is finally collected and drawn off at the bottom of this Gasifier. It is an efficient technique which has the capacity to process the biomass containing the moderate moisture (up to 30%). About 5 to 10 minutes time is needed to ignite the combustion and bring the plant to an operative temperature.

Downdraft Gasifier is best suitable for the applications where the temperature control is critical, and the cleaner fuel gas is required. These Gasifiers can be used in those applications where moderate temperature is required up to 1100 Degrees Celcius.