Given the number of variables present in the model proposed, a rice husk price was fixed (10 CFA francs/kg) in order to make possible some further considerations. The following graph (Fig. 6) shows the minimum technical requirements of the stove (expressed in terms of overall efficiency) to be convenient. Maintaining fixed the costs observed on site, the mlc stove adoption would
result sustainable up to a threshold of minimum efficiency equal to 7.5%, that is significantly lower in comparison to the actual efficiency level obtained in the tests performed