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These type of stoves force the gases and smoke that result from incomplete combustion of biomass fuels back into the cookstove's flame, until almost complete combustion has occurred, resulting in very few if any emissions. Gasifier stoves are also known as Top Lit Updraft (TLUD) stoves because some fuel is lit from the top of the stove, which forces combustible gases to pass through the flame. Gasifier stoves can also include a fan, to improve mixing of flame, gas, and smoke and to reduce emissions.
Source: Global Alliance for Clean Cookstoves