Fumes purification method (by mixing)

A method of purification of fumes with condensable gaseous contaminants, including the steps of generating a flow of fumes to be treated in a heated area (2); generating a flow of cold fluid so that the air temperature is lower than that of the fumes to be treated; mixing the flow of cold fluid with the flow of the fumes to be treated to generate a mixture flow in which a condensation of the contaminants is induced and to force a nucleation of the condensed contaminants; conveying said mixture flow into an inertial separator unit for its purification.