[Increase in the temperature of fire fumes. Proposal of a mathematical model].

The ventilation instability generated by hot fumes on the return airflow of a fire, especially in workings with appreciable differences of level, has been largely studied and approached by numerous calculation attempts. French experts had the idea to adapt to this problem a calculation model that was previously elaborated to evaluate the temperature evolution in deep strata cooled by a ventilation roadway. The speaker shortly exposes this model and stresses that complementary research is necessary.