Thermolysis of samples is achieved inside an oven called "Fire model", designed to simulate fire conditions. This fire model was previously designed by the LEMD at the occasion of studies carried out for the purpose of toxicity studies on materials in the conditions occurring at the building level. This model essentially a cubic chamber takes into account the energy of radiation reflexed on the walls in order to meet these building conditions. It is therefore close to the mathematical model with 2 zones of actual fires proposed by the National Bureau of Standards. In that NB Model, a convective heath released by a given source reaches very rapidly the ceiling, but a radiative energy is sent rewards to the bottom, which has the result to give a part of the calories to back to the source. The hot exhaust gases are release at the top, which ensures convection and defines therefore two zones of temperature in the chamber. This model was applied to a series of wooden construction lumber, composites and bush plants.

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