Abstract: A noise abating impeller having a disc-shaped central hub and a plurality of blades extending radially outward from the central hub. The blades are symmetrically arranged in quadrants around the central hub and within two alternating quadrants, each blade is spaced an increasing distance apart from a prior adjacent blade and within the other two alternating quadrants, each blade is spaced a decreasing distance apart from a prior adjacent blade. The impeller also has a dividing rib located along the entire outer peripheral edge of the central hub and located along the center of the blades dividing each blade into a first blade half and a second blade half. The first blade half is offset from the second blade half.