Selector machine to clean incoherent material in particular wood-based and to eliminate inert materials contained in said incoherent material, comprising - a selection compartment able to receive a flow of incoherent material and in which there is a roller selection assembly configured to feed said incoherent material in a direction of feed and comprising a plurality of rollers disposed adjacent to each other on a common lying plane and disposed in said direction of feed at an increasing distance one from the other in said direction of feed defining respective discharge gaps (14, 14') for the passage of incoherent material selected as a function of said discharge gaps (14, 14'), so as to obtain, in said selection compartment, at least a first selection zone and a second selection zone in sequence in said direction of feed and having different discharge gaps (14, 14'), - at least one collection chamber disposed below said lying plane under said second selection zone and the machine being further characterised by: - said at least one collection chamber being provided with first air introduction means configured to convey a first flow of air under pressure toward said lying plane, through said rollers, - an air-type separation unit, disposed downstream of said roller selection assembly and configured to convey a second flow of air under pressure toward said lying plane to intercept incoherent material at exit from said roller selection assembly. - a selection compartment able to receive a flow of incoherent material and in which there is a roller selection assembly configured to feed said incoherent material in a direction of feed and comprising a plurality of rollers disposed adjacent to each other on a common lying plane and disposed in said direction of feed at an increasing distance one from the other in said direction of feed defining respective discharge gaps (14, 14') for the passage of incoherent material selected as a function of said discharge gaps (14, 14'), so as to obtain, in said selection compartment, at least a first selection zone and a second selection zone in sequence in said direction of feed and having different discharge gaps (14, 14'), - at least one collection chamber disposed below said lying plane under said second selection zone and the machine being further characterised by: - said at least one collection chamber being provided with first air introduction means configured to convey a first flow of air under pressure toward said lying plane, through said rollers, - an air-type separation unit, disposed downstream of said roller selection assembly and configured to convey a second flow of air under pressure toward said lying plane to intercept incoherent material at exit from said roller selection assembly. - said at least one collection chamber being provided with first air introduction means configured to convey a first flow of air under pressure toward said lying plane, through said rollers, - an air-type separation unit, disposed downstream of said roller selection assembly and configured to convey a second flow of air under pressure toward said lying plane to intercept incoherent material at exit from said roller selection assembly.