Quite higher effectivenesses are observed in relation to corrective measure of extraction by means of external sump with natural draft b, showing effectiveness results of 58% and 53% for basement and ground floor 1, respectively.
Se observan efectividades bastantes superiores a la que daba la medida correctora de extracción por arqueta exterior por tiro natural b, que mostraba unos resultados de efectividades del 58 % y 53 % para planta de sótano y planta 1 respectivamente.