Abstract: Method of separating vaporous or gaseous impurities from an air or gas flow by means of an adsorption filter wherein, after the filter has attained a predetermined loading of the impurities, the impurities absorbed in the filter together with an inert gas produced by stoichiometric combustion and conducted in a circulatory loop through the adsorption filter, are fed desorbed and together with excess gas escaping from the circulatory loop to a combustion chamber and consumed in the combustion chamber with excess air adequate for complete combustion includes supplying the heat energy necessary for the desorption to the ineat gas conducted in the circulatory loop from exhaust gas of the combustion chamber through a heat exchanger traversed by both gas flows and separating both of the gas flows from one another.