Method for removing a filter unit from a laboratory extraction hood, relative filtering and safety removal kit, and laboratory extraction hood

A method for removing a filter unit from a laboratory extraction hood in safety conditions for an operator and for the surrounding environment comprises the steps of: a) sprinkling the filter unit with a solidifiable encapsulating solution ; b) waiting for a solidification period so that the solution , solidifying, prevents the filter unit from releasing into the environment contaminating toxic substances which have been previously retained during operation of the laboratory extraction hood for the analysis of samples or objects, and c) extracting the filter unit from the laboratory extraction hood . A kit for actuating the aforesaid method is also disclosed, and a laboratory extraction hood comprising this kit.