The present invention relates to a rotor (90) applied to an extractor- fan assembly (80) for agricultural machines , especially for sugar- cane harvesters , the rotor (90) comprising a set of blades (1) fixed to a hub (2). Each of the blades (1) has such a construction that defines a root angle (3) that may range from 47 to 59 degrees, a medium angle (4) that may range from 53 to 69 degrees and a trailing angle (5) that may range from 66 to 78 degrees. Due to the construction angles of the blades (1), the air flow comes in contact with the rotor (9) smoothly , without any turbulence in its displacement ,which results in high efficiency and efficacy of the extractor -fan assembly (80).
